Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3019794af39950d…

MALICIOUS

PDF

75.1 KB Created: 2021-03-10 04:57:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6927de7d71ebac768b071a424973c779 SHA-1: 00551e6c6d1ad82ce9631a416fa6b60ae966169c SHA-256: c3019794af39950df2c8b6f12619e7c1cbf3de62dcae5c7192d5fc20e819de1f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, suggesting it's part of a phishing or malware distribution scheme. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which can be used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/award?keyword=arariba+plus+matematica+7+ano+pdf PDF link annotation
    • http://pubggaming.online/bronfenbrenner_ecological_model_essaysb0k3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451563/normal_603a15238da13.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/ihd8O3f/panzer_platoon_mod_unlimited_money.pdfIn PDF document text
    • http://ca-manalapan.space/understanding_earth_7th_edition_answers75ohn.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/ehbkia5/28917072096.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414488/normal_5fe4b6ae36339.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/jh19haY/jitowagatifikav.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/pekekopugupoxadanajedp0vr.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://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_77764fd360f646df93e6675eae132732.pdf?index=trueIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_2957a04e042642edbb1c62c021a0ccc4.pdf?index=trueIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_3d1fedc4dd9149dcaeec73c436a0894d.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_b449672de8e248fb815633ce3a97721d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/wetijuwekejifumuneta.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/saxeduxuxul.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_fec2d6ff044146acbb98d1366a23509d.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_e04ac32464494f9baacea06d485fc5e6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 5392 bytes
SHA-256: fd4bde6dc6fd70949a89b3808673c49683ff78da2f439e5f443d0a873a96697d
font_01_sfnt_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 10424 bytes
SHA-256: a46387f58b06ec7ff8bb285fc288166dcb97076db9444ce8ac5019db6596833b
font_02_sfnt_off0001117a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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