Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a9a0a77e3f9676…

MALICIOUS

PDF

69.9 KB Created: 2021-06-03 16:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c112a17c5362458c04bc0ac34c9a1ba0 SHA-1: 26fe6d17a2dedd5000933faef368ebdeeb269649 SHA-256: 86a9a0a77e3f96765bf97edc9c08deb65f073c430cda8d76d182dc3d25309e09
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The presence of embedded URLs and the overall structure strongly indicate a malicious intent to lure users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://allytemp.ru/pbw?utm_term=possessive+nouns+worksheets+for+grade+3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481408/normal_5fdbb619dbe86.pdfIn PDF document text
    • https://lajofezev.weebly.com/uploads/1/3/4/6/134603150/7c259.pdfIn PDF document text
    • https://gunosevibo.weebly.com/uploads/1/3/4/7/134716368/tupozusamujiba.pdfIn PDF document text
    • https://lafotavesa.weebly.com/uploads/1/3/4/6/134633764/venamofenebefidifag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467571/normal_605b13bf7caba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404113/normal_60296ea345aae.pdfIn PDF document text
    • https://pazopoxe.weebly.com/uploads/1/3/5/2/135293382/bfe2a29.pdfIn PDF document text
    • https://besekexedonake.weebly.com/uploads/1/3/2/7/132741764/78d67a.pdfIn PDF document text
    • https://gavokafiwafez.weebly.com/uploads/1/3/1/3/131381231/d4c12.pdfIn PDF document text
    • https://vigenawora.weebly.com/uploads/1/3/4/4/134495248/rozezozakozov_ramod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482619/normal_601aae9b17afd.pdfIn PDF document text
    • https://rokolumer.weebly.com/uploads/1/3/0/9/130969153/e77d5.pdfIn PDF document text
    • https://xunatopek.weebly.com/uploads/1/3/2/7/132710497/vanigu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459939/normal_5ffea862d84ec.pdfIn PDF document text
    • https://biwezufum.weebly.com/uploads/1/3/4/8/134872286/98752.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joxakuruvi.pbworks.com/f/81471319829.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/70122766084.pdfIn PDF document text
    • http://biwonuv.pbworks.com/f/50020955975.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/6th_grade_common_core_math_worksheets_with_answer_key.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/f/descargar_paint_tool_sai_2_espaol_2019.pdfIn PDF document text
    • http://nukuxim.pbworks.com/w/file/fetch/144485130/logitech_z-2300_circuit_diagram.pdfIn PDF document text
    • http://mutoteja.pbworks.com/w/file/fetch/144510441/biochemistry_study_guide_answer_key.pdfIn PDF document text
    • http://gajufabeke.pbworks.com/w/file/fetch/144423048/wobijutepoxa.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_off0000d18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18A 5516 bytes
SHA-256: c71ff0a9ccf61b3874029eb8b213d06c1296b078ceea9fef644e01ae823237eb
font_01_sfnt_off0000e464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE464 10500 bytes
SHA-256: dc4d5cc042422b95c01babc455fea30f0670baea49797ec41c97a71da06b2ac9