Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f8943a112c8d82…

MALICIOUS

PDF

76.8 KB Created: 2021-04-01 18:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bb318d2327a82e5cb85513fc38bb9947 SHA-1: 12212038a752730c393e94418f1dc291bd2d99d6 SHA-256: 94f8943a112c8d82942b3ced7d790809b00086bf0ac17979d61430ee23bcf97a
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 0.9997

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://botokaw.ru/wix?keyword=nomao+apk+download+ios PDF link annotation
    • https://jowovodepavilim.weebly.com/uploads/1/3/4/6/134651336/gifugewod-gugabuvozudagi-donita-pegoruzal.pdfIn PDF document text
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/selunokaberula_fososewaz_sarelofegux_totajilubaduvup.pdfIn PDF document text
    • https://pupogonixim.weebly.com/uploads/1/3/4/3/134318621/8188335.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451752/normal_6001ba26b363d.pdfIn PDF document text
    • https://voberugupov.weebly.com/uploads/1/3/4/4/134496708/9796785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393625/normal_603e9d0917587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_600ae6c57981c.pdfIn PDF document text
    • http://dubetones.22web.org/literatura_brasileira_arcadismo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384155/normal_602eb54849f2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414167/normal_5ffa7773373fc.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/ea524ef1ba98a.pdfIn PDF document text
    • https://zozijopese.weebly.com/uploads/1/3/3/9/133997316/7891023.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/ropukidotupe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc9e3cf-75f9-4b3a-9c98-bb562c651111/tobutusanoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/824ee98a-4604-4e73-912f-888923f05a01/someone_like_you_jekyll_and_hyde_lyrics_karaoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30464a68-4ef6-4851-9268-788878fc2955/marketing_plan_definition_kotler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/127f1d6e-046e-4253-8fe5-5238998051ed/who_were_the_gods_and_goddesses_of_ancient_egypt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe99439-c22a-48db-8ce9-2233e61cbeaf/18719088346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/993e902a-ab45-4d4b-a540-6ffe9fb44f28/rajuvenudobif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29bf3670-7124-4ed8-b212-4688ae179a8f/vukonegavosatojow.pdfIn PDF document text
    • http://betesemimototi.rf.gd/bahubali_movie_songs_tamil_free.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_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 5136 bytes
SHA-256: f9ca9fc96a303a68cd2029ffe44ed232dc923185eec18ed6c437802d5ffa031d
font_01_sfnt_off00010102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10102 10896 bytes
SHA-256: af4bac466d670c59057d87dfd6524101c2e68de0f5d21503fab996bae7f59ac4