Malicious PDF — malware analysis report

Static analysis result for SHA-256 6341219ec486e177…

MALICIOUS

PDF

95.0 KB Created: 2021-04-09 20:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a2f411ad5ba9187ab7feefa3e98ee90 SHA-1: 7d402bcf77fbcc1ae9d0f00797c95fb5ffc3e33f SHA-256: 6341219ec486e17787bae93c18276e06d582b547240e8aae8718e8795fc6a5f4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://resalured.ru/strik?utm_term=ifc+investment+officer+salary
    • https://jufomefafuxujo.weebly.com/uploads/1/3/4/8/134890319/9069422.pdf
    • https://zopopalolidipe.weebly.com/uploads/1/3/4/5/134500843/zopufavoje.pdf
    • https://dutofubexel.weebly.com/uploads/1/3/4/6/134631161/dokiroxowewomakojo.pdf
    • https://sejoxamopizava.weebly.com/uploads/1/3/1/8/131858661/3670566.pdf
    • https://rijagadufe.weebly.com/uploads/1/3/1/6/131606992/5d083337dcd.pdf
    • https://xixasoxi.weebly.com/uploads/1/3/5/3/135324484/maponosuzabegoxiv.pdf
    • https://gukufevekexuse.weebly.com/uploads/1/3/5/3/135305262/b335a246.pdf
    • https://cdn-cms.f-static.net/uploads/4476947/normal_6051ee90cb2f1.pdf
    • http://dakixofib.22web.org/alcon_rebate_form_for_mailing.pdf
    • https://cdn-cms.f-static.net/uploads/4406213/normal_60633340e58f4.pdf
    • https://cdn-cms.f-static.net/uploads/4464861/normal_606126afc4992.pdf
    • https://fexagire.weebly.com/uploads/1/3/0/7/130775556/latodikijobinijudot.pdf
    • https://static.s123-cdn-static.com/uploads/4461746/normal_5fdf7f9822698.pdf
    • https://static.s123-cdn-static.com/uploads/4381988/normal_5fef7dfaa2c89.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mivuzovi.epizy.com/mobetenoxo.pdf
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_425e1b23c8554f40b8e6d41fc6766f2e.pdf?index=true
    • https://s3.amazonaws.com/tipikaxe/rumegikidasisesifora.pdf
    • https://s3.amazonaws.com/xuzed/codycross_answers_group_29.pdf
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_f4733f94922847869cb4216718701a4d.pdf?index=true
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_dee7a55134b544f8ab2f381ea68d8972.pdf?index=true
    • https://s3.amazonaws.com/wizidimawag/restaurant_booking_confirmation_email_template.pdf
    • http://selobotugiw.rf.gd/how_to_analyse_complex_issues.pdf
    • http://xuziruwunev.rf.gd/66846017107.pdf
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_2635b96ca8d14e30b6c8824386b3b887.pdf?index=true
    • https://s3.amazonaws.com/bidemewufa/9779576936.pdf
    • https://s3.amazonaws.com/purufiz/98169879380.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133e3.bin
6351073bd14238409d623adb59ffe6f0c4931b4f4036f0b3a094dc7f741ea83c
pdf-font-stream PDF embedded font (sfnt) at offset 0x133E3 5124 bytes
font_01_sfnt_off0001454c.bin
f60deea70650ca93434eec6f4dcd526f8f8311a655cc0de37a59b6dcdff91d14
pdf-font-stream PDF embedded font (sfnt) at offset 0x1454C 11992 bytes