Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bbc7cffc6d3eab…

MALICIOUS

PDF

74.9 KB Created: 2021-03-17 17:22:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 674e112ce697143878c7aca6e8f3f2d1 SHA-1: 0e8e39cb05ddf2a62f5b8df85f6cdfd405d7ffc2 SHA-256: 79bbc7cffc6d3eab4734dddafdc867d4bc8914ca270e783a909b62058c7c28e5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to book summaries and software, likely serving as a lure to encourage downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/strik?utm_term=the+power+of+habit+summary+amazon PDF link annotation
    • https://cdn.sqhk.co/mixubiki/hidbdid/salakutuner.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/XiC6lFw/email_notification_sounds_iphone_6.pdfIn PDF document text
    • http://polfact.site/3159688816z3ap8.pdfIn PDF document text
    • http://dvigatel.guru/machine_learning_books_freejqfsv.pdfIn PDF document text
    • https://cdn.sqhk.co/tatudawo/fhbXhfM/download_game_head_ball_2_mod_apk.pdfIn PDF document text
    • http://pufaxokijajijev.22web.org/tebinun.pdfIn PDF document text
    • http://ketosimple.online/honeywell_th9320wf5003_wi-fi_9000_manuallkkf9.pdfIn PDF document text
    • https://cdn.sqhk.co/fupipevu/fhjfDlz/58883706131.pdfIn PDF document text
    • http://begetus11ppz.xyz/76544107494h9fwt.pdfIn PDF document text
    • https://cdn.sqhk.co/zisenusaf/b6fAjVd/vukajanusekekusa.pdfIn PDF document text
    • http://voztrans.ru/sniper_elite_5_gameplay_pcly9aa.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/niaDNgh/tekofitatuzulezidajetuw.pdfIn PDF document text
    • https://cdn.sqhk.co/komajekolino/dgehage/jurassic_world_the_game_twitter.pdfIn PDF document text
    • http://shoop-ff.ru/47536369437m3cim.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/15my0C4/rugby_world_cup_2019_overall_standings.pdfIn PDF document text
    • http://vatamulejuvovi.22web.org/lowozesofevoga.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/hggeijO/lebara_australia_app.pdfIn PDF document text
    • https://cdn.sqhk.co/gukituzaju/hmhbcIc/lagux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mononivutaxutu.rf.gd/8146396590.pdfIn PDF document text
    • http://damaxokabipo.epizy.com/uniforme_chasseur_ardennais_1940.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_99c91001745943189a24b66084e95d6e.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_e09f97ddf48e47f390cc33811008db82.pdf?index=trueIn PDF document text
    • http://jijaxiroloru.rf.gd/how_to_reset_a_gfci_switch.pdfIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_7e77991b909a4cf98a0cabf833453329.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_off0000e510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 5440 bytes
SHA-256: af299536035aa74824af28664035eb768326930f044bd16d193482cbc9e43384
font_01_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 11440 bytes
SHA-256: 6b6c8db136d531710bca70f881c4a10ffe8d9b07a26e9fc52aa80a27990be841