Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b02236a470baa9b…

MALICIOUS

PDF

70.8 KB Created: 2021-04-01 22:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 48a52dfec46bf1f8c425ac0c1353def0 SHA-1: b0ca029061f18e64cf778b44327eac441375da05 SHA-256: 4b02236a470baa9b5c861e23a4d743906f5463edfe18a3e903edd480ecd11168
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous external URIs, with a significant number pointing to disposable hosting. The primary purpose appears to be directing users to a large number of external sites, potentially for SEO manipulation or to host malicious content like phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/award?keyword=2020+calendar+printable+uk+pdf PDF link annotation
    • https://lifusapemar.weebly.com/uploads/1/3/4/5/134526201/6602278.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453333/normal_5fe42e774492b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426556/normal_5fd2253f3a2ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_605fae052c8d7.pdfIn PDF document text
    • http://betmoy57.com/kobegopusesammz6ny.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401694/normal_6065da2d83593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369494/normal_5fdbdc3e797a5.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/5c634443a6fb1bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_601b9ac3095c0.pdfIn PDF document text
    • http://trylait.club/amoeba_sisters_video_recap_diffusion_answer_keyn4nmh.pdfIn PDF document text
    • http://fridgeservice.ru/louisville_attic_ladder_partsbf4ha.pdfIn PDF document text
    • http://blancer.xyz/bhagavathi_full_video_songkdyu2.pdfIn PDF document text
    • https://fijoxivivuf.weebly.com/uploads/1/3/4/0/134041864/6a150dd6e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462345/normal_601bf12d57223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452626/normal_604aba1323706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413475/normal_603ea4a2cbe3a.pdfIn PDF document text
    • http://todayit.pro/xemajovipixasulidobaprm3nb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_26983b9893804bc8bf30676acae6b0cc.pdf?index=trueIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_e97c78589c974334953bd4bdfcf7fb5d.pdf?index=trueIn PDF document text
    • http://menasore.epizy.com/nogab.pdfIn PDF document text
    • http://kegonen.rf.gd/fajofavulo.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_off0000d858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 5356 bytes
SHA-256: 2e3cacfe0ef0a9923904002f40786967b3226ddb371837a92b537c195f3f1a13
font_01_sfnt_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 10224 bytes
SHA-256: a908c9111c88498b3896d2f7264c7ff4563c8d14982b24a115c2100ee0a32251