Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b997dfc2057cb7f…

MALICIOUS

PDF

86.5 KB Created: 2021-04-02 10:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e7b414c8e5098766f7fcdd26d3109977 SHA-1: b5ac1936e207b1809554a96b1c13183e6615623c SHA-256: 4b997dfc2057cb7fb9c305058d1b09fe6a6393b1243588ece3c35267137c1460
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting, suggesting an attempt to redirect users to potentially harmful content. The presence of embedded URLs and the PDF structure indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/strik?utm_term=can+fleas+be+killed+by+water PDF link annotation
    • http://verification-help.com/41863738961oz7zc.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/BgfBgji/jidetur.pdfIn PDF document text
    • http://gidpopiteru.com/teaching_job_application_letter_format_in_nigeriay7hyu.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/heUidGk/sisaduwu.pdfIn PDF document text
    • http://curvepreloved.com/access_backed_up_android_photosehte5.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/ieiictC/idle_dragon_merge_the_dragonsky_mod.pdfIn PDF document text
    • http://idclick.cash/marvel_future_fight_guide_2018a77dm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492278/normal_602a43081f6df.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/gFOieif/wegefunivozavakofer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464065/normal_5fd6831ebbd8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454966/normal_6020d4309e22c.pdfIn PDF document text
    • http://sandiego-podcasts.com/sokedarebosupizesij373oe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_605fea88700fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_421798a0b6744db1ab07e0466d3882d9.pdf?index=trueIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_ceedce0ec36844ccbc7e96cedaf2f2f1.pdf?index=trueIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_3dbad87a6ea640e28391562ab1eae01e.pdf?index=trueIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_b67d5441c17642d4904d8c1410acd1d6.pdf?index=trueIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_58b6feafdd56414eae2ccef495fff67b.pdf?index=trueIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_9c5ba2903f3a4c8a961e56c2d3387004.pdf?index=trueIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_d2926150fbfb47bd97c7a34aa53a13ed.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_8321d59f64fa4882a0cbddce97d65299.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_38f8e4b9a5ce40ab9ca9ea1f907ffc5d.pdf?index=trueIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_08840ed4c7a54e12a3d221ae8d29dd65.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E4 5204 bytes
SHA-256: f9187cd4e08060442ceb5c29f5359ac84132ae89c9d8676dac36ee543403910f
font_01_sfnt_off000125bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BD 11484 bytes
SHA-256: fe17e570f0ed3acd4579c6673c6439ca7f37b3aaadb19b6d55d244d9649076db