Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e264ff25160dd61…

MALICIOUS

PDF

76.7 KB Created: 2021-03-20 03:17:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b1dcea6d9665c78e3cdcf7c6621e298 SHA-1: 12434c4a874a51ab3423467c3093a67451baaba7 SHA-256: 6e264ff25160dd61ead7f6e8886e59b7cb2c4f61bbb8f9185c8bd4fbfa05eb6f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning model assigned a high probability of maliciousness. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO spam operation. One of the embedded URLs, 'https://ponafet.ru/123?utm_term=python+print+format+f', is suspicious and likely part of the malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/123?utm_term=python+print+format+f
    • https://cdn-cms.f-static.net/uploads/4450424/normal_6046fd4b368f2.pdf
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5fd835ccde233.pdf
    • https://cdn-cms.f-static.net/uploads/4477629/normal_6023caceb8a2a.pdf
    • https://cdn-cms.f-static.net/uploads/4491414/normal_601485a75ea34.pdf
    • https://cdn-cms.f-static.net/uploads/4454803/normal_60552d2736bf2.pdf
    • https://static.s123-cdn-static.com/uploads/4469349/normal_5fe0ade3267c2.pdf
    • https://cdn-cms.f-static.net/uploads/4374359/normal_601b6dfac93a2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_dd952e6842b34fc9b95ff7c8bb16fe77.pdf?index=true
    • https://uploads.strikinglycdn.com/files/60489347-335e-482a-ab79-46c077294486/tevuvomixugukixewaru.pdf
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_adf9140437f2424da7bb1de869193357.pdf?index=true
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_aa70ca925395431f92265a252f62a992.pdf?index=true
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_e9d4b9b019764a3295ef238a27f8965e.pdf?index=true
    • https://s3.amazonaws.com/nevovumowa/95339429095.pdf
    • https://uploads.strikinglycdn.com/files/66cdb440-97fc-4ee1-85f5-9214af79fe8f/oxford_word_of_the_year_2020.pdf
    • https://s3.amazonaws.com/sorogamat/free_aerobic_exercise_steps_videos.pdf
    • https://s3.amazonaws.com/putelekireza/calculating_force_mass_and_acceleration_worksheet.pdf
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_ee36dd9cf1b843fe9c74490335635954.pdf?index=true
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_8fd0a604103841f9a23b6aa0faf17a0a.pdf?index=true
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_1fa285fbd8514f6db15175da55b4fa52.pdf?index=true
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_cafdda292bcd47ebaea52a8b7493c1ee.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee74.bin
76805f5053d9e89437c03149fc1c57424e121b26a4455024190a33548ab58ac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 5032 bytes
font_01_sfnt_off0000ff71.bin
0c8b5363a2c3cb0a8ca4fb00e6f1dd291b5995e577d026f551d99330975373ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 10736 bytes

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