Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ffb9730e3f2fcd…

MALICIOUS

PDF

77.1 KB Created: 2021-04-03 14:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36b901a031c57b27b8ce2de14625eb06 SHA-1: 959ef88fe8e6ea4007a7764b2d162374d51f0dc4 SHA-256: a8ffb9730e3f2fcdf27132311af02a17d9a2561ea55363fb8e2dbad4f47d1e88
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links intended to manipulate search engine results or direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=how+to+use+excel+formulas+in+vba
    • https://cdn.sqhk.co/vilitemeru/4EJLihP/world_hockey_championships_2020_highlights.pdf
    • http://pay-order.info/sat_score_range_2014ecabk.pdf
    • http://kukushpa.fun/kosasaxazimlcyow.pdf
    • https://jarofuzaduse.weebly.com/uploads/1/3/4/5/134502270/745492.pdf
    • http://topsol.xyz/sutofagibelologibasaj09xuw.pdf
    • https://cdn.sqhk.co/gosukutusu/lligvCK/75003359245.pdf
    • https://tagelararejo.weebly.com/uploads/1/3/4/8/134846357/pipaxinogiwejiz.pdf
    • https://cdn.sqhk.co/vuwonesi/fs0ihgj/17265249769.pdf
    • https://zuvaxufar.weebly.com/uploads/1/3/5/9/135993026/0075479e5d9eb80.pdf
    • https://wikifepum.weebly.com/uploads/1/3/3/9/133986434/a1b8ab0530b3c.pdf
    • http://itgermany.net/pebivakigevefarifapijije1wedl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tazopaju/almost_famous_imdb_parents_guide.pdf
    • https://uploads.strikinglycdn.com/files/0b7a4d02-e0b8-42c9-b4b1-a633b705cc82/statistics_for_management_and_economics_11th_edition_ebook.pdf
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_6bf4a62247ab44b1aac23095ce02c25e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/20c55388-8792-4b1a-bb6d-c28ae29db8c1/the_giver_audiobook_chapter_13_and_14.pdf
    • https://s3.amazonaws.com/tiduro/excel_vba_find_method_wildcard.pdf
    • https://b0b89e74-75d6-43b0-bb8f-fa2cd9bd5f5b.filesusr.com/ugd/b5ae3e_eaa9e8edee6744c29d9808c2c1498c24.pdf?index=true
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_0a2225df06cc4f2a94ac3d6650086833.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d878c989-bcc1-4d43-b2dc-243457d2cad3/nutemonuvoja.pdf
    • https://uploads.strikinglycdn.com/files/923bf55b-b72d-45f5-9498-d77ca66b817f/84362507383.pdf
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_b5428735d5754dd6a052713844e729a4.pdf?index=true
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_36956ae8e30549f99e889f0bca0d1b27.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_off0000ed31.bin
37a64d18d5670f698978385607ca13a79a864090a4201167c03a4268afb410e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 5348 bytes
font_01_sfnt_off0000ff63.bin
cce57017f0be39a933bd096146b3048fa28993303e121f4427334b7759c01af2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 11648 bytes

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