Malicious PDF — malware analysis report

Static analysis result for SHA-256 d456ba5069041dc3…

MALICIOUS

PDF

71.2 KB Created: 2021-01-20 14:11:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef6de517f793c52339c41a7faeac4dd5 SHA-1: eee66566034d214f9f641e5e6ae9f9fe49d2b374 SHA-256: d456ba5069041dc3f20a29ed76075eee84648bb6957e8276f9c3b5e5d6a83520
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to potentially malicious domains or link farms, suggests an attempt to redirect users or manipulate search engine results. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest it's designed to lead users to harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/wb?keyword=best%20chocolate%20ice%20cream%20recipes%20uk
    • https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/1603880.pdf
    • https://vurinilobato.weebly.com/uploads/1/3/1/4/131454355/kolalubesa-fumuge-pevubofabiroku-seramimonowa.pdf
    • https://sowujapureku.weebly.com/uploads/1/3/0/9/130969862/solipizidajiwezege.pdf
    • https://dufofumiwiz.weebly.com/uploads/1/3/5/3/135309849/bdf8ebdc9243b.pdf
    • https://luwegojozokozop.weebly.com/uploads/1/3/0/9/130969796/6128798.pdf
    • https://cdn.sqhk.co/besuduxikuvo/gewCBmw/7122770229.pdf
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/2736159.pdf
    • http://kidunotofonaxiz.22web.org/rukaveligoxutulejipen.pdf
    • https://zevijilutijeso.weebly.com/uploads/1/3/4/8/134850931/finefikazeju_palapupexenukog_mozudozav_memurijumane.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pimibini.epizy.com/ayuntamiento_de_madrid_cursos_formacion.pdf
    • https://s3.amazonaws.com/tipikaxe/asos_australia_returns_form.pdf
    • http://fepasike.epizy.com/cash_flow_indirect_method.pdf
    • http://roniwixanedif.epizy.com/boxamosilazixelenomolubem.pdf
    • https://s3.amazonaws.com/pasawe/video_from_webpage_app.pdf
    • https://s3.amazonaws.com/fujadabez/amazon_chime_4._17.pdf
    • https://s3.amazonaws.com/xupimaral/apc_back_ups_es_700_user_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d974.bin
90e80161abc0de3d724ce2c260f5c65acc6b4aa14915b492bd3c1bcf6b3a0c25
pdf-font-stream PDF embedded font (sfnt) at offset 0xD974 5284 bytes
font_01_sfnt_off0000eb47.bin
82848b7b9d423ee82163a115c7f112c19666e15a8ec21968f8cb7d7f1a240f67
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 10688 bytes