Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7bc9d073c9bedd…

MALICIOUS

PDF

69.0 KB Created: 2021-03-07 17:36:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 074994b4acf00e63e245809d37104ffe SHA-1: dff1c771b09ea6468a77e64cd9fa530c5e5bab8e SHA-256: 4b7bc9d073c9bedd8b80f7672acc02882f3a8fa9e2975c3d0ad42996ba870b5c
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classification and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to generate SEO traffic or redirect users to malicious sites. The embedded URLs and the document's structure point towards a phishing or spam campaign, likely delivered as a spearphishing attachment.

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 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://jacksth.ru/wix?keyword=biology+laboratory+manual+pdf PDF link annotation
    • http://tivulaxovena.22web.org/libro_planeacion_estrategica_chiavenato_gratis.pdfIn PDF document text
    • https://xijofufakeziti.weebly.com/uploads/1/3/1/3/131380729/3340726.pdfIn PDF document text
    • https://cdn.sqhk.co/xijisejes/ihiMigX/5929823692.pdfIn PDF document text
    • https://cdn.sqhk.co/dubeminap/yhcgejd/binalizedodi.pdfIn PDF document text
    • http://foxiwirilavisan.22web.org/sanojif.pdfIn PDF document text
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/4428715.pdfIn PDF document text
    • https://fumasidabufip.weebly.com/uploads/1/3/0/7/130775820/pijedo.pdfIn PDF document text
    • https://tebebutak.weebly.com/uploads/1/3/4/7/134744698/5ef3f8b.pdfIn PDF document text
    • https://dodarumobite.weebly.com/uploads/1/3/1/4/131437296/kakofom-motofuvim-wepupizatafepa-balerovifugiri.pdfIn PDF document text
    • https://cdn.sqhk.co/lizubenesowi/jX2jiig/70271988090.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/wizakokowe/xagepegus.pdfIn PDF document text
    • http://wumevagijez.epizy.com/latale_w_treasure_hunter_guide.pdfIn PDF document text
    • http://varowok.epizy.com/relefazafejawa.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_6bcca517aa144ddc863e5a392f99d4bd.pdf?index=trueIn PDF document text
    • http://kugidozu.epizy.com/jotisedezexewegi.pdfIn PDF document text
    • http://ragigixo.epizy.com/gefiboranekuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/shadowrun_returns_wiki_weapons.pdfIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_986e8bed98474b05bbbfc79bf4724091.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_4c23ff40ce394abc9112b46edc6c638f.pdf?index=trueIn 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_off0000cf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF04 5476 bytes
SHA-256: 77f5f13ca3f9ff4a9e5ad48549e01c5891e9ff1484c944238bf7788d75736c26
font_01_sfnt_off0000e195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 11032 bytes
SHA-256: fa72f5585c4b053d8194c954f164ef0924f7c1d212f876537aa902690c04eb0f

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