Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edec0776b0851c9…

MALICIOUS

PDF

66.5 KB Created: 2021-02-24 02:12:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9cfe69d06bc8e1baed99ca8932101654 SHA-1: 5186f0156dcf3a1a7d3a39f7a3cef2fbd60a1cdc SHA-256: 9edec0776b0851c964d34d300b1bcb0c38d202bc5dd386b75f35c579070524fb
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external URLs pointing to other PDF files, likely for SEO manipulation or to distribute further payloads. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common vector for malicious PDF exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=buku+slow+and+steady+get+me+ready PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368999/normal_5fe9f5e79a19a.pdfIn PDF document text
    • http://movikewenatorug.iblogger.org/kajibu.pdfIn PDF document text
    • https://metolokinazez.weebly.com/uploads/1/3/1/4/131452743/ab061dc5cf833.pdfIn PDF document text
    • https://gikexirubunos.weebly.com/uploads/1/3/4/6/134644737/zodijeb-fekafudokeb-xezixo-xitosiderofik.pdfIn PDF document text
    • https://jisiresofuwidi.weebly.com/uploads/1/3/0/7/130739297/4f91475d1533.pdfIn PDF document text
    • https://fugakesuj.weebly.com/uploads/1/3/0/7/130776648/6722438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5fdc2b61cbd9d.pdfIn PDF document text
    • https://gugamuwapubadek.weebly.com/uploads/1/3/0/7/130740318/5288726.pdfIn PDF document text
    • http://bivozebavi.iblogger.org/chicken_run_ps1_game.pdfIn PDF document text
    • https://mixuvuweti.weebly.com/uploads/1/3/1/4/131483588/f16a4841eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kizawudeto.rf.gd/ajooba_movie_all_song.pdfIn PDF document text
    • http://tidizovebimike.epizy.com/jinijobuzowirofezanod.pdfIn PDF document text
    • http://gamalebivufije.rf.gd/kifuwokujofomuseku.pdfIn PDF document text
    • http://lufuzefaz.epizy.com/belujelaxarejovove.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_off0000c882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC882 5452 bytes
SHA-256: d7abbad8fe735b24e7e4974df6d22c96f7c5c645677c78683f985b0aebd860df
font_01_sfnt_off0000db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 9996 bytes
SHA-256: f52514d57528ad5dc7b2fdeee8fa1e963ff249948ee1e7c61c84b987223f6c62

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