Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea174efcfc0980d…

MALICIOUS

PDF

77.6 KB Created: 2021-05-11 22:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: be437d0eb8c067c0a5225f220279a2a1 SHA-1: 43da8cd4f973d45dc986d2bfca068f98a547db6a SHA-256: 1ea174efcfc0980daf5f9f2703a526ba8248685488210511e02754a2195de2d1
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of outbound links, with one pointing to 'http://rozipiliwune.epizy.com/wugabitegisowu.pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=how+to+bar+a+soldier+from+reenlistment PDF link annotation
    • https://cdn.sqhk.co/jonidamifene/1gjkjd0/61409169741.pdfIn PDF document text
    • https://bowogemiris.weebly.com/uploads/1/3/4/3/134316512/925d72.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/h4jb1mw/more_pc_games_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/iggjj4Y/rexroth_axial_piston_pump_catalogue.pdfIn PDF document text
    • https://cdn.sqhk.co/kekagate/aiajbjh/nasty_goats_apk_mod.pdfIn PDF document text
    • https://majivuwuwu.weebly.com/uploads/1/3/2/6/132683475/nobim.pdfIn PDF document text
    • https://duwutevo.weebly.com/uploads/1/3/4/5/134597351/gozalegalogowen_xujovevupawa.pdfIn PDF document text
    • https://cdn.sqhk.co/rusobotakox/Qhcigc9/69483805469.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/davufedojuja/hiNJgjO/anonytun_8._7_mod_apk.pdfIn PDF document text
    • http://gugaferur.22web.org/spring_framework_4_download.pdfIn PDF document text
    • https://cdn.sqhk.co/raninogozo/gi6ifji/pisanamubokisinuzuxowaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/6S7Yihd/rulowozokovuzibowixuko.pdfIn PDF document text
    • https://cdn.sqhk.co/litalile/dggk5Pb/underseat_storage_f150.pdfIn PDF document text
    • https://cdn.sqhk.co/xifinelire/igjiSjc/40454658457.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/jjhiazU/49945290812.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/8977dd6ac8d7b42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rozipiliwune.epizy.com/wugabitegisowu.pdfIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_8028c0d4ac8141f6868a7989b22c33a1.pdf?index=trueIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_1bcde65beca34ab680ab36503f61bb9a.pdf?index=trueIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_f521d1e5750a4be2b20316bc411d5ca0.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_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 5244 bytes
SHA-256: 8e11cec76a1accb682dcfd09222ad5f646d5b61f7c70b25c7fae9894701c1ad0
font_01_sfnt_off000103ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 10492 bytes
SHA-256: c9c1187eb95f388755af937a71289538f62a827cd37008a2b6a7afdd878decd3