Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fe8c6cf1fad689…

MALICIOUS

PDF

70.2 KB Created: 2021-02-08 23:29:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 043e7c11551519b2ea6fa614bd2cdf95 SHA-1: 72f7d4fa90ba18e8da3f7a6708cf29bca4694873 SHA-256: d5fe8c6cf1fad6895f17c4da0a087db870a506df410d2345023044f0c6cb29bf
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. While no scripts were explicitly extracted, the presence of external links and the 'SE_INVOICE_LURE' heuristic point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jottigo.ru/aws?utm_term=framed+ink+pdf PDF link annotation
    • https://kunagotuj.weebly.com/uploads/1/3/0/7/130739098/lajumuruke_pudikewenoz_gonasu_boninetabew.pdfIn PDF document text
    • https://muzuwetabez.weebly.com/uploads/1/3/1/4/131483468/rasiposiwazinutiw.pdfIn PDF document text
    • https://suwisabinupa.weebly.com/uploads/1/3/5/3/135351097/nuruxijapadesi-dajabekop-bidodavo.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/8f47299c139e7.pdfIn PDF document text
    • https://fubareno.weebly.com/uploads/1/3/1/4/131482864/foxeseze.pdfIn PDF document text
    • http://vomojagibolib.iblogger.org/pusabekixogezubebif.pdfIn PDF document text
    • https://fukituxepuronip.weebly.com/uploads/1/3/4/6/134605821/pexogid-gavopenef-xafuram.pdfIn PDF document text
    • https://dizavobezovedup.weebly.com/uploads/1/3/5/3/135313146/bovisanusituzizoju.pdfIn PDF document text
    • https://zexakadobad.weebly.com/uploads/1/3/2/6/132682290/papebolebo.pdfIn PDF document text
    • http://virnet77.ru/monster_truck_hill_climb_drive_offroad_gamesel5k4.pdfIn PDF document text
    • https://maxijegiv.weebly.com/uploads/1/3/4/1/134131269/99170350b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://temekem.epizy.com/bangladesh_cricket_theme_song.pdfIn PDF document text
    • http://fejusadifidexi.epizy.com/animation_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/general_information_about_personal_computer.pdfIn PDF document text
    • http://kovodolalaloru.rf.gd/28183333449.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_off0000d524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD524 4996 bytes
SHA-256: cbababcc3e89a3f6d441c3b06011af01547164aef0a6b2c0ba8ba451a8ce4236
font_01_sfnt_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 11264 bytes
SHA-256: fb40c45851212c13493c5167e94c3dd1defa51758c6bda7e8def1fc31203a318

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