Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2972684af43edd…

MALICIOUS

PDF

89.2 KB Created: 2021-04-14 11:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 73e9763a31734416d1f8d0a133bc7e72 SHA-1: 27c703eee6b1a68b6263b7eb7020c2e0f5faafb2 SHA-256: cb2972684af43edd0a79c83c780e3c54ff31a54244801596a55581c7b684f67b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains like weebly.com, suggesting a link farm or phishing lure. The presence of a 'bob revolution flex stroller recall' query in one URL indicates a potential social engineering pretext. ClamAV and ML classifiers strongly indicate maliciousness, and the PDF structure is consistent with SEO spam or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=bob+revolution+flex+stroller+recall PDF link annotation
    • https://lanokonemuke.weebly.com/uploads/1/3/5/3/135309959/3aea27fefcf37c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503692/normal_604679bf3e700.pdfIn PDF document text
    • https://cdn.sqhk.co/kujotukil/7ieJiil/transformers_robots_in_disguise_season_4_episode_1.pdfIn PDF document text
    • https://vigobekopu.weebly.com/uploads/1/3/2/3/132302998/dixomurezapogewob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377100/normal_5fffe861626b6.pdfIn PDF document text
    • https://mafugefowodofo.weebly.com/uploads/1/3/1/3/131378796/2124819.pdfIn PDF document text
    • https://sevimuxeso.weebly.com/uploads/1/3/0/7/130739978/pesowolaw.pdfIn PDF document text
    • https://pavedivagew.weebly.com/uploads/1/3/4/4/134468388/e3c29dfa76f13.pdfIn PDF document text
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/mizuxixenimojaz-wixux-zojasove-subofefivaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378848/normal_604a480fc84e5.pdfIn PDF document text
    • https://jutegejedexugak.weebly.com/uploads/1/3/5/3/135384922/d51e8acd032bbf.pdfIn PDF document text
    • https://virataxutepubom.weebly.com/uploads/1/3/0/8/130874282/japopasizokobuvaxumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482009/normal_600cebd9531f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391605/normal_601b42bd9ac6f.pdfIn PDF document text
    • https://cdn.sqhk.co/kekagate/ahggdvu/61620027937.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/IThehbR/lagalomuwazikajenegix.pdfIn PDF document text
    • https://duzozerijadid.weebly.com/uploads/1/3/4/4/134493401/vomakuwe.pdfIn PDF document text
    • http://pakekoramiduwin.getenjoyment.net/asterios_polyp_download.pdfIn PDF document text
    • http://mereritijazos.scienceontheweb.net/missing_alphabets_worksheets_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_4d927ebf86f84ddfabe4ee0f1be243c3.pdf?index=trueIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_5270cd2de13747fb85ec81563de31814.pdf?index=trueIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_5a1c7ea377b04a0290ec151044050f4e.pdf?index=trueIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_0c09aff8525546cc95c4cb34b9cf5737.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_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 6736 bytes
SHA-256: 7bb27fa2f68fd7d7a2a3e591a01132c61c1cfc12bd3d31d61f4b36dd6969cc33
font_01_sfnt_off00011a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1D 5192 bytes
SHA-256: 6e1648c0af940c705f416a0f4357c61a8dc0614514c61123c2a287cd502d545f
font_02_sfnt_off00012be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE5 13388 bytes
SHA-256: 4bbbf78b327e7e99397988cef1c2135d457e0f968a7ff13303bcc94a58b44e5d

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