Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcb1b4a72e34410…

MALICIOUS

PDF

51.2 KB Created: 2020-11-07 21:39:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 676ad4ead5c1257e90833bb614afa10c SHA-1: 565a160624480855f25a20e44d179e7009d31cfc SHA-256: fdcb1b4a72e34410f35c43781381ec4c55158f6bc21bced607d9b4791bad325b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external links suggest it is designed to redirect users to potentially harmful content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://trafficel.ru/123?keyword=onn+ond19aah22+wireless+headphones+manual PDF link annotation
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/c88fb6205bef4b.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/keneres.pdfIn PDF document text
    • https://tesokumerapaj.weebly.com/uploads/1/3/4/5/134522001/tokimitik-rivilosuxipani.pdfIn PDF document text
    • https://paboludozov.weebly.com/uploads/1/3/4/3/134333588/d2ccb893937.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/5590407.pdfIn PDF document text
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/boginumepux_joxatasugudo_nubajo_lokiniz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://getalam.files.wordpress.com/2020/11/ruduronu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87cb5628-60f2-4cf4-9169-a7b0633168a4/tanesas.pdfIn PDF document text
    • https://zivepezugese.files.wordpress.com/2020/11/raturulijaparamaxezovuwur.pdfIn PDF document text
    • https://jopafez.files.wordpress.com/2020/11/29741260071.pdfIn PDF document text
    • https://pubosepiko.files.wordpress.com/2020/11/96065257551.pdfIn PDF document text
    • https://rovamidenube.files.wordpress.com/2020/11/manual_de_servicio_toyota_tercel_1993.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_off000089eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89EB 5660 bytes
SHA-256: 1187a531715043c074cc138cf554e7e764ec27516ef44edea2055320af56c5f8
font_01_sfnt_off00009d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D1A 10396 bytes
SHA-256: f3d26569da271e13feed281f17a9b77cd98ca5944163992147390dbad4442e44

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