Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5dd805c8a6c4a29…

MALICIOUS

PDF

70.2 KB Created: 2021-01-20 01:03:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3df4c9472e8b3a334d5e97fd759d95ce SHA-1: 5bca4b73e41039d06d1cbaffb8e28a42eaec4a0d SHA-256: f5dd805c8a6c4a2956dd5382c9d0dc97e2ac12899d90879b60f1b69f4aa3f334
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/123?utm_term=caravan+mcat+book+pdf+free+download PDF link annotation
    • https://likifovufuli.weebly.com/uploads/1/3/4/5/134588617/dexidogibimizu-vovujofef-gevanoze-xatigelikaxali.pdfIn PDF document text
    • https://galidenik.weebly.com/uploads/1/3/1/8/131856819/673b39dd104e924.pdfIn PDF document text
    • https://wiwanozamo.weebly.com/uploads/1/3/4/3/134306351/1124183.pdfIn PDF document text
    • https://babewepuk.weebly.com/uploads/1/3/4/3/134311046/tobexitomaxafuxogi.pdfIn PDF document text
    • https://rimixobavi.weebly.com/uploads/1/3/3/9/133987070/5920027.pdfIn PDF document text
    • https://rasofenetiko.weebly.com/uploads/1/3/4/8/134862321/8102874.pdfIn PDF document text
    • https://site-1172895.mozfiles.com/files/1172895/zoferu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448116/normal_5fae02059c941.pdfIn PDF document text
    • https://bigevavez.weebly.com/uploads/1/3/4/0/134016854/8d1c861e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426257/normal_5feafc0b95533.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/lomogas/cvs_app_download.pdfIn PDF document text
    • http://fakesux.epizy.com/72472055273.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/letterhead_template_latex.pdfIn PDF document text
    • http://wijotifiku.rf.gd/nuxavujudaxegufake.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_off0000d3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C4 5384 bytes
SHA-256: fdde5b5a074e2fec997b8542a41d305dbafed4e7a3b825fa5b88c16aef5f4f30
font_01_sfnt_off0000e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 10948 bytes
SHA-256: ef6fa2fa87319147f52c30c30de4459642fe530ec6cc51df6d6291543ce41f29

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