Malicious PDF — malware analysis report

Static analysis result for SHA-256 571ef93ea9506a0e…

MALICIOUS

PDF

75.8 KB Created: 2021-03-07 19:30:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5c3d083cbae61d83097cee4b79c6c876 SHA-1: c9016c391a1bbedbaaa3745049067f0218c47619 SHA-256: 571ef93ea9506a0e3fe53f845f0bd6a78206ac0ede2306d7be6774b5a59f8569
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting or unknown domains, suggesting a link farm for SEO manipulation or phishing. The document body, though heavily obfuscated, contains references to driver downloads, aligning with the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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://gimoguvi.ru/award?keyword=asus+m2n68-am+plus+video+drivers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446925/normal_5fc8d4bac411a.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/ghkiacG/jabew.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/blood_shadows_slime.pdfIn PDF document text
    • https://vajefusuvujob.weebly.com/uploads/1/3/4/4/134464162/xefasobanibosewuke.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/v1Qhigd/zombie_street_fighter.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/73169531595.pdfIn PDF document text
    • https://komidozikozapuf.weebly.com/uploads/1/3/1/4/131455883/109e80dc28f1.pdfIn PDF document text
    • http://getepitisux.mywebcommunity.org/what_does_the_word_power_structure_mean.pdfIn PDF document text
    • https://zudasejavezumuj.weebly.com/uploads/1/3/4/0/134017640/fegudi_tixivopewaberiw_bezejazufuw.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvuwisarov/bkiehc2/stick_fight_archer_mod_apk_unlimited_money.pdfIn PDF document text
    • https://sugulone.weebly.com/uploads/1/3/2/7/132740418/pakezemiropifimenex.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/ghjcjb6/75052013546.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491155/normal_5ff773f761924.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_04c712df0cdc4743806679b36de84fc9.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_02272da9067d4c379647ed586621dd4b.pdf?index=trueIn PDF document text
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_caae61d162df469ea0e4d168de3efe77.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_5c761ff90cd94b83b3c741d3116f8188.pdf?index=trueIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_532acb0513224abaa29ab2037c1cab66.pdf?index=trueIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_372bc39210314583a115450ec254b687.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_d61f95bcfc99467383158f58337bf55f.pdf?index=trueIn 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_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 5668 bytes
SHA-256: 651f467dde10198d86c8e92e341f8e48191a49913dec5f2bfc6b8de4aebc75b7
font_01_sfnt_off0000fdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC5 10592 bytes
SHA-256: 51d9c4da744747dd077ab532924d6ee31a6e83a28bef6894ce3a6b1866596850