Malicious PDF — malware analysis report

Static analysis result for SHA-256 526f5fa2f8d396c0…

MALICIOUS

PDF

87.0 KB Created: 2021-04-28 01:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d41a4c0b83b41224139ed29345daf946 SHA-1: 5434ac6a28b157734b21eae293b778227b31305d SHA-256: 526f5fa2f8d396c0d7172a71a676b9692cae9dcdb1ea2a7f5444dec4983fc0f8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://fokemale.ru/strik?utm_term=coleman+quad+pro+800l+led+lantern+review PDF link annotation
    • http://leaninrzpd.site/how_much_does_entry_level_it_job_pay9rlgc.pdfIn PDF document text
    • http://rumepado.mypressonline.com/jepolovijul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_5fdc6c35b2fd4.pdfIn PDF document text
    • http://habercigo.com/game_theory_textbooks11ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464077/normal_5fdd9f55bc0f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472760/normal_60375637a7238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464529/normal_606ea8f524654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391047/normal_601eabf973030.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://vimabanu.sportsontheweb.net/65503518066.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_e7e8ed8b69e542ed873e2fee023da808.pdf?index=trueIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_4c2554964b8e4825a9f734f45b8ff44a.pdf?index=trueIn PDF document text
    • https://6fc76513-a17a-4053-940d-bef108f5ea85.filesusr.com/ugd/3a5ef0_4a6d1656872343d5a9b2e0502659a313.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79ec8f17-d987-49a8-9a79-de08d41229cb/kividatuxusuzunemi.pdfIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_bd7fc23d40f342c7a65176f1daf07603.pdf?index=trueIn PDF document text
    • https://a8a57b57-a5e9-4b5c-b824-02731ce3a1bd.filesusr.com/ugd/cfa667_37c71f32c7d44ce7848f8a400c6fc29b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e375f267-6871-41da-b715-b637fa02f673/will_dominos_do_vegan_pizza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bb8645-0246-4f42-a429-33f37f69fa1f/how_do_i_become_a_certified_icf_coach.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85805586-d9ae-40d9-b7ca-34f6e8aa51f2/jisuvar.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 5448 bytes
SHA-256: f0d7d02bd76c8db77da77c2da01a4e66eb25bf2f806e2dacc65f285572810403
font_01_sfnt_off00011c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5B 10728 bytes
SHA-256: a16a1db74cdac7012be3860e3815228f1e5e7f2ce9c0e4d8f4dace849fb0a3e1
font_02_sfnt_off000140e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E4 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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