Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4086e9682fec31…

MALICIOUS

PDF

80.2 KB Created: 2021-04-24 23:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: aa9844e449a4e3e826b465c269e17492 SHA-1: e7a58f0fc856000272fd7e0447b1488b2deec35b SHA-256: 3f4086e9682fec3134cda35e173c67d8b63f4be23a918b48a0f17b1ee865a8ef
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, many pointing to PDFs, suggesting a link farm or SEO poisoning attempt. One of the primary URLs, 'https://pelibifir.ru/strik?utm_term=what+are+the+objectives+of+operations', is likely part of a phishing or malware distribution scheme. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=what+are+the+objectives+of+operations PDF link annotation
    • https://revegeworosopo.weebly.com/uploads/1/3/1/6/131637057/soxobexozilabel.pdfIn PDF document text
    • https://wevofuru.weebly.com/uploads/1/3/4/6/134670173/8291679d1.pdfIn PDF document text
    • https://cdn.sqhk.co/dupeguwova/pAhfwhb/pov_car_driving_mod_apk_rexdl.pdfIn PDF document text
    • https://zumavoga.weebly.com/uploads/1/3/1/3/131383266/rokojoles-megusojonujazef-xewupukonetef-zinagap.pdfIn PDF document text
    • http://pewekelexu.mygamesonline.org/neonatal_bartter_syndrome.pdfIn PDF document text
    • https://laxonetamaj.weebly.com/uploads/1/3/4/0/134096763/849945.pdfIn PDF document text
    • https://bijoxopibomer.weebly.com/uploads/1/3/4/3/134325560/8865957.pdfIn PDF document text
    • https://cdn.sqhk.co/romekeka/Xuib2jb/kgf_maa_ringtone_mp3_download_pagalworld_dj.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/purawuma/87396272188.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/behringer_audio_interface_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/merixu.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/kizera.pdfIn PDF document text
    • http://bilofudako.onlinewebshop.net/altivar_71_catalog.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/42776445607.pdfIn PDF document text
    • http://wuragumok.atwebpages.com/scale_factor_word_problems_kuta.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/bofaxirikux.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/wivizotopazetezezuzeb.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_off0000fc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3D 5360 bytes
SHA-256: 35ace609db473db449a8d5e9ddca1181af82edd8304385f5081a51585fba5009
font_01_sfnt_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 10904 bytes
SHA-256: 082d730b08cffc19142e995734067f308b894fce5d8aa78d98c70932473c3346

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