Malicious PDF — malware analysis report

Static analysis result for SHA-256 f174364f30127d64…

MALICIOUS

PDF

76.5 KB Created: 2021-03-12 15:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ae18e29fbc6036a45aa6fd026fbc0005 SHA-1: 5004f49dd5b5a39c739d5d57f69747c49e8e54b9 SHA-256: f174364f30127d6469f2fe8f224befc6bd5c1029932d848d3d1b6df253c164ab
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://dafemum.ru/award?keyword=cissp+practice+exams+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422637/normal_600b07c4a315d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411932/normal_60148e00e9854.pdfIn PDF document text
    • https://pawuxadatunu.weebly.com/uploads/1/3/4/2/134266652/2461597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417321/normal_602d448a22960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_5fd6591a375bd.pdfIn PDF document text
    • http://nasty666.space/assateague_island_va_surf_reportr7ssq.pdfIn PDF document text
    • https://pubodepilup.weebly.com/uploads/1/3/1/4/131406337/c3bc06b243e60.pdfIn PDF document text
    • http://tryporte.xyz/biloveluworusedonutolariv4j45.pdfIn PDF document text
    • https://tofibozuliven.weebly.com/uploads/1/3/1/1/131163910/gokupirilo.pdfIn PDF document text
    • http://sis-paypal.com/english_advanced_vocabulary_and_structure_practicect9ar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485689/normal_5ff69dc286843.pdfIn PDF document text
    • http://netzamka.ru/piriform_ccleaner_windows_10_freech4ht.pdfIn PDF document text
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/sasotopelejeme-kajuw-gagurofopuzas-mekimudukogeni.pdfIn PDF document text
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/senixukelerazosuwimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422386/normal_6017022339725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402964/normal_602a1255d7a4c.pdfIn PDF document text
    • http://help-bluebadgecenter.com/affiliate_marketing_strategy_templatebfcel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luzigipo.epizy.com/vivonotidikowinodiburav.pdfIn PDF document text
    • http://fudowoxalukiki.rf.gd/79327302036.pdfIn PDF document text
    • http://keberefan.rf.gd/soundarya_lahari_telugu_song_lyrics.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_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 5368 bytes
SHA-256: 45e3b8640b325f5cb60f6c05aa100c149d0b3ef95427a3ed07b6f8d13a34d78b
font_01_sfnt_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 15292 bytes
SHA-256: ffd2e94bd66753f10496c7ffc4644ece27862aa6b1de9cc4eec047ab2618f762

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