Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b3fdbc69f6014a…

MALICIOUS

PDF

73.2 KB Created: 2021-02-11 22:46:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 52347fad3502f3d87214ff924e5a4e75 SHA-1: 750c8c1ed864c3cdcd7443f649116791a303739e SHA-256: 70b3fdbc69f6014a5dd3f0499e4e89c67e92075ff4a5a8e3635206de4f7fb369
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate potential for malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=taunton+high+school+graduation+2020 PDF link annotation
    • http://danivufulof.iblogger.org/accountability_partner_guidelines_christian.pdfIn PDF document text
    • http://sudenusona.66ghz.com/76514412385.pdfIn PDF document text
    • https://vonufire.weebly.com/uploads/1/3/4/5/134596457/6028837.pdfIn PDF document text
    • http://dusixose.22web.org/15286751313.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447270/normal_5fc8639a59726.pdfIn PDF document text
    • http://jodazok.22web.org/chester_barrie_shirt_size_guide.pdfIn PDF document text
    • https://wezoduvum.weebly.com/uploads/1/3/4/0/134096245/6547727.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486535/normal_5fca70a0bb420.pdfIn PDF document text
    • http://jukofokunazevam.iblogger.org/judicial_california_voter_guide.pdfIn PDF document text
    • https://jugijivarute.weebly.com/uploads/1/3/4/6/134620481/1746661.pdfIn PDF document text
    • https://jimigafekalese.weebly.com/uploads/1/3/1/4/131407537/943e1.pdfIn PDF document text
    • https://vamepaxokuwi.weebly.com/uploads/1/3/5/9/135959455/7108258.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://boponewutizubi.rf.gd/77199031984.pdfIn PDF document text
    • http://bajivuselome.epizy.com/15779705068.pdfIn PDF document text
    • http://nemanox.rf.gd/64795194831.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_off0000df53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF53 5424 bytes
SHA-256: a1235058b5f45d91e532dc67c802bfa9d06c50199a7bc74ad3c01c7fe04f2f70
font_01_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 11172 bytes
SHA-256: c1e0f508dcccffe508dbf4b57de6a23b2194397f16b819ac0409efddd1ddb99e

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