Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cfebaf3b81b348…

MALICIOUS

PDF

79.2 KB Created: 2021-04-18 22:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e3f9f3b8a8af3d0af0343b8cb359ca4b SHA-1: 2122f6d25dfe5c0722e5fd58a31628e36241a868 SHA-256: 86cfebaf3b81b34862a2185fb6625e726157c9a89ca719ab5db148cbac7b2e45
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://lozipotod.ru/strik?utm_term=hp+laserjet+100+color+mfp+m175a+imaging+drum+price PDF link annotation
    • http://esclick.pro/rinnai_space_heater_spare_partsoe7g5.pdfIn PDF document text
    • https://govexofube.weebly.com/uploads/1/3/1/8/131872198/8d124.pdfIn PDF document text
    • https://woxejisuwu.weebly.com/uploads/1/3/4/3/134322210/b80347e6c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472763/normal_601a9ae1a8c3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415524/normal_6052f205edd6a.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/hfJz6AL/sneakers_er_midsole_paint_pen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372702/normal_60150b0f6b91e.pdfIn PDF document text
    • https://jefolujolu.weebly.com/uploads/1/3/6/0/136096950/pivogobolavibi.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/i6Ejhs5/harrisburg_farm_show_complex_2020_schedule.pdfIn PDF document text
    • https://lutowixo.weebly.com/uploads/1/3/4/7/134705225/78729.pdfIn PDF document text
    • https://cdn.sqhk.co/bexuxoxabim/jggd0hi/79491230523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450336/normal_5fdbdc908a8d1.pdfIn PDF document text
    • http://twobigs.space/42186699383m5gib.pdfIn PDF document text
    • https://mufabevazom.weebly.com/uploads/1/3/1/3/131382955/nejuse.pdfIn PDF document text
    • http://tradebot.space/vilisaseniw5bz7.pdfIn PDF document text
    • https://tojumofudino.weebly.com/uploads/1/3/2/6/132681199/bekerenuro-lalefowobigifux-lirapolu.pdfIn PDF document text
    • https://xibagepop.weebly.com/uploads/1/3/1/4/131438114/fufamurakim_wenozimune_vinesaxidirona.pdfIn PDF document text
    • https://sukorason.weebly.com/uploads/1/3/4/5/134578332/a200dc0ba4e4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472501/normal_602c07725c338.pdfIn PDF document text
    • http://bandalet.club/sistema_endocrino_y_sus_partes_en_ingleszoe5x.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/nevowimo/4788570123.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/jopovatepake.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_off0000eedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 5908 bytes
SHA-256: f50261d1eff4ba01adff3727042088058007bb285af02dfc12ec71d7e629af8f
font_01_sfnt_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 12328 bytes
SHA-256: 86eb2ef48d99ea855417677e655c326df9e23681d7c147bea08d2ef107fea772