Malicious PDF — malware analysis report

Static analysis result for SHA-256 f210941cec8eec6e…

MALICIOUS

PDF

90.0 KB Created: 2021-04-01 10:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a60cd4ad176ce1859ff92de4690ed9c6 SHA-1: b089de8cadfde934152144ab17babca44dbff62a SHA-256: f210941cec8eec6e43ba1b62299f89b4258a5b15dd25e434aac7acfbb61f6b33
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially malicious content or phishing sites.

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.
  • 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://xezojetit.ru/wix?keyword=harbor+freight+drill+press+table+top
    • http://digtalcaliper09.xyz/34858886854pydtp.pdf
    • http://virnet77.ru/basic_accounting_principles_in_bengalif7xzg.pdf
    • https://cdn-cms.f-static.net/uploads/4479707/normal_60494b0f39730.pdf
    • https://cdn.sqhk.co/vakanaju/b6jgQjg/ates_su_oyunu_2_kisilik_oyna.pdf
    • https://cdn.sqhk.co/kawinojos/7hi0egj/63982015303.pdf
    • http://whalesqpa.fun/puvotagoniabmz6.pdf
    • https://cdn-cms.f-static.net/uploads/4416792/normal_605d685c4e9e4.pdf
    • https://cdn.sqhk.co/mamevugixej/UFij1Un/66390425289.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_5ec5346a3f424603aeeedb77a53f7c63.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4c9603db-2174-4e2a-8e19-d9addf2c59a9/are_mugs_microwave_safe.pdf
    • https://uploads.strikinglycdn.com/files/6d40efaa-80b9-4f3b-9d30-adbf7ed53cf0/19497854832.pdf
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_dd6e52b6fbfb4889a57550a1a08ed89c.pdf?index=true
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_3e781f0941e842a3ae8c1746f346d695.pdf?index=true
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_991f848e0fb54f63b045b8fa52f8d4e9.pdf?index=true
    • https://a3abd3d7-f7e4-4b0c-86b7-ec358d8c805a.filesusr.com/ugd/97a3b3_8bfb9a56f69d4c6c97d5dd4aefd7b27e.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7d.bin
fcf3e18f95a6936afdeeedd672e07eb762f580dba96c8fa7f22ab072cc2831af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 11292 bytes
font_01_sfnt_off0001125c.bin
cac604ad62986f9da2d2187c18a2b3e0671cf23603d20f678989a7731c6226b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1125C 5084 bytes
font_02_sfnt_off000123ba.bin
701c6ba9a116cb94ee0126465f50ed3675b6dadea8d51f1c88a3120d338c3e9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123BA 12480 bytes
font_03_sfnt_off00014ca7.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA7 4324 bytes

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