Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94bc2ec6ef435bc…

MALICIOUS

PDF

83.3 KB Created: 2021-05-17 19:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0ce4fe11bf5248e5824c93f489025b34 SHA-1: c9a5ccd27b3587d813abe556eb0229fd6860ad35 SHA-256: c94bc2ec6ef435bc4d1f9592e7c640d29ecf41fc89c2e4eb6b32bb5cd707af06
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=the+rules+book+online+dating PDF link annotation
    • https://naxosetoj.weebly.com/uploads/1/3/0/7/130775404/6664687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447273/normal_6049a50431f1e.pdfIn PDF document text
    • http://detonic-ufficiale.website/atlas_shrugged_part_1og1ix.pdfIn PDF document text
    • http://viruxego.mygamesonline.org/astro_tv_guide.pdfIn PDF document text
    • https://zogoporev.weebly.com/uploads/1/3/1/3/131381602/dotubuzulif_tezajigunu_jilamoxe.pdfIn PDF document text
    • http://academic-club.ru/xesojexusonisuguwilpw6rb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389604/normal_5fec98a9bf696.pdfIn PDF document text
    • http://segwaywheelchair.ru/dafenukik3doym.pdfIn PDF document text
    • https://josaboduzez.weebly.com/uploads/1/3/1/6/131637311/4610894.pdfIn PDF document text
    • http://nefritthebestthing.site/90905715891ksafk.pdfIn PDF document text
    • https://ralerafuzirepob.weebly.com/uploads/1/3/4/3/134386916/kizasujepin.pdfIn PDF document text
    • https://videxopejevis.weebly.com/uploads/1/3/5/3/135333638/8948777.pdfIn PDF document text
    • http://dakajak.medianewsonline.com/30665945693.pdfIn PDF document text
    • http://zenarajare.22web.org/barasefivubezowexob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gefelabofine.rf.gd/financial_aid_application_form.pdfIn PDF document text
    • http://borusatare.rf.gd/43680110195.pdfIn PDF document text
    • http://danuxobuzo.rf.gd/laziguse.pdfIn PDF document text
    • http://tupudenijusab.rf.gd/ridgid_10_sliding_miter_saw_review.pdfIn PDF document text
    • http://zavinawotomuvef.epizy.com/gundam_rise_from_the_ashes_dreamcast.pdfIn PDF document text
    • http://rabuvof.rf.gd/76365209049.pdfIn PDF document text
    • http://nakepusejedub.epizy.com/birmingham_new_street_to_cardiff_platform.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_off0001086b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086B 5240 bytes
SHA-256: 39945af5ca650a8409d27ad636e1dc34d5f5809b33841a8baf0f2f8bcc61179c
font_01_sfnt_off00011a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2E 11032 bytes
SHA-256: 395781549b10ed944200a65d37b2cb66cd5dd71338012885f70a30285ce104c1

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