Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65ea8a24a79dd41…

MALICIOUS

PDF

79.6 KB Created: 2021-03-13 18:04:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 382c2314de61cc385793f3b6f3b6410b SHA-1: e4e1268c427f1af60fbadcdf29ef04e7b7617841 SHA-256: f65ea8a24a79dd4134bafda0ed8d50bab916be6adeef87a0064bd1a2ffadf902
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/strik?utm_term=winning+jack+welch+publisher PDF link annotation
    • https://cdn.sqhk.co/nesadatifu/dghXic9/vice_president_debate_2020_transcript.pdfIn PDF document text
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/rirarolasupewosenutu.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/50728575273gn8ez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454430/normal_6034dedc291a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_604ca4f9bf58f.pdfIn PDF document text
    • http://liketime.fun/what_is_iyengar_yoga_uku9bz8.pdfIn PDF document text
    • http://zubiki.top/android_developer_options_explainedylgte.pdfIn PDF document text
    • https://gozobamo.weebly.com/uploads/1/3/4/7/134714837/3c1e55e419.pdfIn PDF document text
    • https://pagipakudux.weebly.com/uploads/1/3/5/3/135343553/rexaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459477/normal_6043f03dc398d.pdfIn PDF document text
    • https://siwufofewexiv.weebly.com/uploads/1/3/5/3/135329456/vevabevilurazetuwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_6042fc14a012d.pdfIn PDF document text
    • https://cdn.sqhk.co/vekudaselux/hf5a5ij/deep_town_mining_factory_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459641/normal_603f3bd079045.pdfIn PDF document text
    • https://cdn.sqhk.co/kobadaxo/Odjfmha/sumibifoxetinavog.pdfIn PDF document text
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/d9e8f7bf0d47.pdfIn PDF document text
    • https://leditolovon.weebly.com/uploads/1/3/2/6/132682688/kilonunilufaror.pdfIn PDF document text
    • https://sukizasatesez.weebly.com/uploads/1/3/4/6/134686833/zinovunem.pdfIn PDF document text
    • http://sadovik.me/52665653641hz4mc.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://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_de31c90f98dc4337bffa8dcded74824d.pdf?index=trueIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_f360e9c4e1c74c3f9c9b4c62fa37cef9.pdf?index=trueIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_f7699db959064b76848dacf3269e15da.pdf?index=trueIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_443f008dbddc4c898ee5327ff75cd51f.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_off0000e94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 5272 bytes
SHA-256: a7ef790bde0a3088aa2cd1f5042d9edba4072d59a70ebca08dee1184422c65c4
font_01_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 11860 bytes
SHA-256: b49c7155407f9e04eeb24e9b3954f05c136ae6927e9a30fcf6d51b3e0ffbb13d
font_02_sfnt_off000122ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EA 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378