Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8d12875493777e…

MALICIOUS

PDF

81.9 KB Created: 2021-02-24 03:44:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 410df25bcba51093a066f614afebf277 SHA-1: 8fb987e9764dc805a782c2514804ea5f6001bf13 SHA-256: 4b8d12875493777eb169d4ea291cf88d919151ee3daf9435981ee1238cec396c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV specifically flagging it as Pdf.Phishing.Trojan. The embedded links, such as https://seumenha.ru/strik?utm_term=metal+gear+2+sons+of+liberty+vs+substance, suggest a phishing or content distribution vector. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=metal+gear+2+sons+of+liberty+vs+substance PDF link annotation
    • https://zujetopefij.weebly.com/uploads/1/3/4/7/134766602/wisozojidomin.pdfIn PDF document text
    • http://study-english-02.space/234037090251sr2c.pdfIn PDF document text
    • https://voxivunesiru.weebly.com/uploads/1/3/1/4/131407918/dcdd93b9.pdfIn PDF document text
    • https://cdn.sqhk.co/desiruzag/jh74Zgi/fnaf_corrupted_animatronics_wiki.pdfIn PDF document text
    • https://motixovelubebov.weebly.com/uploads/1/3/6/0/136085904/sebar-godomawedefo-vejagi.pdfIn PDF document text
    • https://divebofa.weebly.com/uploads/1/3/4/6/134690115/jasoma.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/ieeUkhi/21995200450.pdfIn PDF document text
    • http://interplast.ru/gurixulesesabisifikektlpf7.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/pDdhg7H/wingsuit_stickman_play_now.pdfIn PDF document text
    • https://wexopusipomela.weebly.com/uploads/1/3/5/3/135313487/tusovedefek_fuzukemunuje.pdfIn PDF document text
    • http://lifeshop.pro/amtrak_pioneer_restorationbewb3.pdfIn PDF document text
    • https://dawerofe.weebly.com/uploads/1/3/4/3/134361643/a04aa938.pdfIn PDF document text
    • https://kigekasomek.weebly.com/uploads/1/3/4/5/134598498/8e8b54b9e14ad3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/bitumen_test_is_code.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/lopelexemifozimujawi.pdfIn PDF document text
    • http://xovafufu.rf.gd/devorah_lev_tov_robb_report.pdfIn PDF document text
    • http://nivajunupoz.epizy.com/how_to_find_instantaneous_velocity_given_time.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_off0001038a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038A 5488 bytes
SHA-256: 9624f09e30cc49a6fd9d117813c497c002e6dbadda7fa8e81c64e26aade18835
font_01_sfnt_off00011671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 10508 bytes
SHA-256: 25ad99a757b1b178e02aea60c55135e1e6c435c5ba1c382b1f764b45ca40369e

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