Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c135d5d4739bbcc…

MALICIOUS

PDF

96.5 KB Created: 2021-05-19 22:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 68cb4ab59468eda260172b8284636355 SHA-1: b12c30f8e799ccf3e7aa24323031c71e29f874e5 SHA-256: 3c135d5d4739bbcc952fec6884df0f1542cfa17fe5c9ec3e41cea4a3a86264cc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cdn-cms.f-static.net/uploads/4409604/normal_601097047a0bf.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4490739/normal_5fd5f4e284fbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490757/normal_605bccb51b3db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452851/normal_603cb6de2edab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455890/normal_60466aab67be4.pdfIn PDF document text
    • https://begopafisofebe.weebly.com/uploads/1/3/3/9/133997970/mizat-ziboselekozubub-satatagol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374013/normal_5fdd762c773e5.pdfIn PDF document text
    • https://jawuwokobot.weebly.com/uploads/1/3/1/3/131381435/difusum_zopoxutigofa_nasepez.pdfIn PDF document text
    • https://nozagovedenide.weebly.com/uploads/1/3/2/6/132682533/sexut.pdfIn PDF document text
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/bunaduxuna_zidiso_tilubutun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_606413a48d123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_60390cd136228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470038/normal_603b26b05f085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387240/normal_60506d0b56632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465559/normal_6052d5e7b18ee.pdfIn PDF document text
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/c6faca5.pdfIn PDF document text
    • https://pelibifir.ru/strik?utm_term=%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D0%25BC%25D0%25BE%25D0%25B4+%25D0%25BF%25D0%25BE%25D0%25B2%25D0%25B5%25D0%25BB%25D0%25B8%25D1%2582%25D0%25B5%25D0%25BB%25D1%258C+%25D0%25B7%25D0%25BE%25D0%25BD%25D1%258B+%25D0%25BD%25D0%25B0+%25D1%2581%25D1%2582%25D0%25B0%25D0%25BB%25D0%25BA%25D0%25B5%25D1%2580+%25D0%25BD%25D0%25B0%25D1%2580%25D0%25BE%25D0%25B4%25D0%25BD%25D0%25B0%25D1%258F+%25D1%2581%25D0%25BE%25D0%25BB%25D1%258F%25D0%25BD%25D0%25BA%25D0%25B0In PDF document text
    • https://pelibifir.ru/strik?utm_term=%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D0%25BC%25D0%25BE%25D0%25B4+%25D0%25BF%25D0%25BE%25D0%25B2%25D0%25B5%25D0%25BB%25D0%25B8%25D1%2582%25D0%25B5%25D0%25BB%25D1%258C+%25D0%25B7%25D0%25BE%25D0%25BD%25D1%258B+%25D0%25BD%25D0%25B0+%25D1%2581%25D1%2582%25D0%25B0%25D0%25BB%25D0%25BA%25D0%25B5%25D1%2580+%25D0%25BD%25D0%25B0%25D1%2580%25D0%25BE%25D0%25B4%25D0%25BD%25D0%25B0%25D1%258F+%25D1%2581%25D0%25BE%25D0%25BB%25D1%258F%25D0%2PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf3ce64a-0d29-453c-a33b-a256dad1448a/66021366525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/593a4f3e-755c-4bcd-a61c-5e9443d3c168/google_maps_api_free_account.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c92bddb9-70ae-47eb-9082-db7c6f7a9438/nakewenivalozizarud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c665826a-808e-4505-a71c-90c8d39392af/13252027125.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 2900 bytes
SHA-256: cb1710376f8bd7bfc5e48332295ee81fe6b64d0562f5d38de4436fc70df1e467
font_01_sfnt_off0000fca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 6128 bytes
SHA-256: 3af591295c51bb1c4d297ad33d7e29d12a64abc0fa13ec887c1b2cf7c5026f53
font_02_sfnt_off000110a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 6520 bytes
SHA-256: 32358e11195b7bc74dc69b1ec77337797b27d2319967fb2d51345f7f977fbe63
font_03_sfnt_off00012295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12295 16260 bytes
SHA-256: 5499545815cc3b4374a55f4f06e1b0493c3094ea1dee3afa46366b2b73e019a4
font_04_sfnt_off000154a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A6 17644 bytes
SHA-256: f24de33294a83de9599207ad9e1f32ee1f35f83c3a45b4c6a577e7dcfa54cdcb

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