Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9816df4d350c925…

MALICIOUS

PDF

75.3 KB Created: 2021-05-17 21:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a2213db59a1d09c12af1452fc5ebe18e SHA-1: d58ff1221b8d2b7f4845f7ca4b34596faa146675 SHA-256: a9816df4d350c925a5425c40e5ec8950dcec9ce7fe45214a97034179b28cbaf7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a site like maypoin.ru for further exploitation. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=how+to+do+fake+nails+at+home+easy PDF link annotation
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/bozotem.pdfIn PDF document text
    • https://givesuporej.weebly.com/uploads/1/3/5/3/135346238/466102.pdfIn PDF document text
    • http://betegozoneseje.iblogger.org/singer_stylist_457_bobbin_problem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480588/normal_606a7e4798adf.pdfIn PDF document text
    • https://dexexufadojobiw.weebly.com/uploads/1/3/4/1/134109071/wavunigenuv_gisipi_sopibozabol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386830/normal_5fdadf05e8bf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_6022fbd02bf76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368976/normal_5fe161449821f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388173/normal_5fc677bb89713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_6069a0025479c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466166/normal_5fdfdb50309cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/feliso/mathematics_textbook_for_class_6_solutions.pdfIn PDF document text
    • http://sulumasofip.epizy.com/virgil_aeneid_book.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/star_wars_canon_novels_reading_order.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/essay_plan_example_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4feb753d-2119-49b6-bd72-49a20f61d663/48492513117.pdfIn PDF document text
    • http://valopuloti.rf.gd/insinkerator_badger_5_manual_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ee8e56-c59a-4823-aa36-9df689515f75/allison_1000_transmission_service_manual.pdfIn PDF document text
    • http://gisudaledusuroz.rf.gd/cinderella_2020_script.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 5272 bytes
SHA-256: a5fac0ff55dde88889c78a7d81fce1b9c54a7a2452c968f98b6b0a4ca1583cdb
font_01_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 11016 bytes
SHA-256: f2bb1d45b760c5693d4fc841596f98e221500990cbeb82a70c16d16c43eb9b6a

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