Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab6d653f4baac44…

MALICIOUS

PDF

78.3 KB Created: 2021-05-11 17:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 75354da5ab66a920862952312357309b SHA-1: cfba1dd6fed02478b0075936828ac267de977e10 SHA-256: 4ab6d653f4baac44cab30a897a91a1456a67a0b704aebcfb61ff92ae7c8c459e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a service manual, likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=hp+officejet+pro+x576dw+service+manual PDF link annotation
    • http://paselon.getenjoyment.net/movimiento_de_caida_libre_ejercicios.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/ed_rosenthal_zero_tolerance_fungicide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470017/normal_60228c1addfa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453332/normal_60532ebcc5da8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374188/normal_60134b74ae83e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_6024c72665540.pdfIn PDF document text
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/xusezowurojebesis.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/nikon_f50_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_603e83f60db30.pdfIn PDF document text
    • https://tepiduti.weebly.com/uploads/1/3/5/9/135974730/jibajigob.pdfIn PDF document text
    • https://bolamowoxuwev.weebly.com/uploads/1/3/3/9/133997192/nogapofuvoserixesega.pdfIn PDF document text
    • https://ziwevanefenej.weebly.com/uploads/1/3/4/5/134591483/8855009.pdfIn PDF document text
    • http://gofofikazujepav.22web.org/que_es_un_proceso_adiabatico.pdfIn PDF document text
    • https://najovukuno.weebly.com/uploads/1/3/1/4/131453374/gataxufaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366350/normal_5fe39e590e45b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374847/normal_5fcd77507ca1a.pdfIn PDF document text
    • http://dafesoxexigu.medianewsonline.com/dupuferux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460450/normal_5fe6a57968bcd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kitawijarital.epizy.com/applied_mathematical_demography.pdfIn PDF document text
    • http://kidereludabiron.epizy.com/53574194855.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/was_the_3rd_estate_started_french_revolution_and_wrote_1st_constitution.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_off0000f3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 5916 bytes
SHA-256: 188df277f1a029d146ff0bed9e6d265215be13625f735208d85f9c03396ec280
font_01_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 10460 bytes
SHA-256: 6ad8da76e27ecff76b3d0bd6b00901aa8623c9396630079d8a1552fcc8ee70e7

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