Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b7394023c36a24…

MALICIOUS

PDF

85.3 KB Created: 2021-06-07 03:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c33378c6f7179bf4a88f9968837f2918 SHA-1: e005828af1aabd573fa4b4ead40f56dcd8676cfe SHA-256: 61b7394023c36a24c3e6029f78c02c731939ff295f374b810af13f3c8814b607
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicative of a link farm or SEO abuse. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

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://irlanc.ru/pbw?utm_term=what+is+the+main+theme+of+the+cask+of+amontillado PDF link annotation
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/484a989f20.pdfIn PDF document text
    • https://bipesulevawitod.weebly.com/uploads/1/3/1/4/131437914/dekopowepawifipifonu.pdfIn PDF document text
    • https://pisolani.weebly.com/uploads/1/3/4/6/134668870/4578186.pdfIn PDF document text
    • https://nukusiluvo.weebly.com/uploads/1/3/4/6/134612364/5912218.pdfIn PDF document text
    • https://wajadotufa.weebly.com/uploads/1/3/1/8/131857144/zabakoxigud.pdfIn PDF document text
    • https://nomikumeparibop.weebly.com/uploads/1/3/4/6/134638052/bd4007ab7.pdfIn PDF document text
    • https://milalidit.weebly.com/uploads/1/3/1/4/131437162/vumirefef-xukidafusibeto-nuluru-relubisevutoril.pdfIn PDF document text
    • https://zogadinarele.weebly.com/uploads/1/3/1/4/131409244/477035.pdfIn PDF document text
    • https://bamukafigozoxin.weebly.com/uploads/1/3/4/8/134861202/dopiwekebetag_bizufi_worabe_ludak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://barotidi.pbworks.com/w/file/fetch/144758097/hd_mp4_tamilrockers_movie_download.pdfIn PDF document text
    • http://fotikeralo.pbworks.com/w/file/fetch/144758511/zezobibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e491b3b-9d19-46d5-aac9-bf6c9be5faa8/how_to_break_generational_curse_of_divorce.pdfIn PDF document text
    • http://luwivaj.pbworks.com/w/file/fetch/144487680/89536773520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f49b2397-6afb-4c79-95ff-492ccee77284/toro_6.5_hp_recycler_lawn_mower_blade_change.pdfIn PDF document text
    • http://welomobo.pbworks.com/w/file/fetch/144606198/sniper_games_online_unblocked_at_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9007ec-872d-48dc-ac7a-9ffe683b82af/19030379487.pdfIn PDF document text
    • http://votekotokuz.pbworks.com/f/68606070649.pdfIn PDF document text
    • http://juwelite.pbworks.com/w/file/fetch/144543447/brawl_stars_nulls_private_server_apk.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/w/file/fetch/144716334/17825086819.pdfIn PDF document text
    • http://jivevisubido.pbworks.com/w/file/fetch/144670917/456977238.pdfIn PDF document text
    • http://zabodovojif.pbworks.com/f/zulerinedobatuzuvigepe.pdfIn PDF document text
    • http://wamotarirup.pbworks.com/f/what_is_the_message_of_the_adventures_of_tom_sawyer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69486aea-e7d2-4aec-9abd-3d8322f88688/do_air_purifiers_with_washable_filters_work.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/english_vocabulary_quizzes.pdfIn PDF document text
    • http://bopelijexuf.pbworks.com/w/file/fetch/144471855/what_is_the_recovery_time_for_a_lumbar_laminectomy.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_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 5240 bytes
SHA-256: 747794c6c12962e46fb16c66603bf3a23bdcc4fc2df28bbfe62a28652cfbcb5a
font_01_sfnt_off000120fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FB 10532 bytes
SHA-256: 0655c53c859c41706ff93c7b154a271d064f73bd2cf339e5f64145cd6d5ebdfc