Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7cef7f2dfbbb38…

MALICIOUS

PDF

78.8 KB Created: 2021-02-22 11:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0d0106f4284c9aa319a2dffabf4939a7 SHA-1: a7b442aecbf2966856faaa0e226ee84f55a70352 SHA-256: fe7cef7f2dfbbb388f05aff4aa1daef26b573f1bfb26920332b8a3eb6dc32436
134 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URLs, many on disposable hosting, and a 'download button' heuristic suggests a phishing or malware distribution scheme. The document body, though heavily corrupted, contains fragments that hint at a download lure, aligning with the PDF_SEO_DISPOSABLE_LINK_FARM finding.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/123?utm_term=are+they+making+a+tintin+2 PDF link annotation
    • https://cdn.sqhk.co/leluforeref/EV6BCgh/7175982139.pdfIn PDF document text
    • https://ziziwatir.weebly.com/uploads/1/3/4/7/134713039/kexomukikevez_bumitope.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/iejasif/fruit_carving_design_apple.pdfIn PDF document text
    • http://mainsale.pro/chuchel_2_apk361qc.pdfIn PDF document text
    • http://mesretly.xyz/arabic_keyboard_for_windows_xp_freefnz9w.pdfIn PDF document text
    • http://magazinrf.xyz/aws_certified_solutions_architect_bookkit17.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/ajGjagd/call_blocker_android_10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454677/normal_5fc6923860c03.pdfIn PDF document text
    • http://busurman.space/thoracentesis_procedure_positionm4mcf.pdfIn PDF document text
    • http://meinekarten.best/guia_completo_calisteniax4k5l.pdfIn PDF document text
    • http://firstreadersclub.com/soul_songs_freeev72q.pdfIn PDF document text
    • https://vejikawotepux.weebly.com/uploads/1/3/4/8/134887167/3779405.pdfIn PDF document text
    • http://nonretloli.site/swtor_after_level_50v9f6o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rujimidujek/toro_lawn_mowers_owners_manual_personal_pace.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 4852 bytes
SHA-256: c4e4c04784f7fb054245c417383622600806a50332fcd04965cbec3cfa00b846
font_01_sfnt_off0000fbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 10728 bytes
SHA-256: f3c32955b603baaf4cd66942f6ed4ed6e527a0f821546fcbe6d2a6d45cdb600c
font_02_sfnt_off00012091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12091 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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