Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c1f48740acaf8f…

MALICIOUS

PDF

77.6 KB Created: 2021-02-28 23:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 00af6066e06ef86a70716d9eb7129244 SHA-1: c2fc6fd84d367a32ee6896c69a463de21d06ff13 SHA-256: d8c1f48740acaf8fb74009c5627939eb9fa9d91a6e07dbf36b297050f5428172
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://resalured.ru/123?utm_term=did+belfort+boat+sink PDF link annotation
    • https://nubenitenaw.weebly.com/uploads/1/3/4/0/134016689/xagidegegiw.pdfIn PDF document text
    • https://gatilesajegume.weebly.com/uploads/1/3/1/0/131070678/77c769a.pdfIn PDF document text
    • https://tutowori.weebly.com/uploads/1/3/5/3/135317166/9558709.pdfIn PDF document text
    • https://xopusetimova.weebly.com/uploads/1/3/4/1/134108877/3082597.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/0d5d073cf5b57.pdfIn PDF document text
    • https://suzujiwome.weebly.com/uploads/1/3/0/7/130776055/492463.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421200/normal_5ffcbc9684448.pdfIn PDF document text
    • https://jameropavide.weebly.com/uploads/1/3/4/6/134699307/5318149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475209/normal_60385a58eb0fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jowuwivipi.rf.gd/marketing_strategy_types.pdfIn PDF document text
    • http://lolofekigosot.epizy.com/dovunifulono.pdfIn PDF document text
    • http://fomupobidep.epizy.com/what_is_oatmeal_on_21_day_fix.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_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 5104 bytes
SHA-256: 35507cd5d20baae3eb3e635716e22818e6cd51e7f9432bc5660e3f1e387041cd
font_01_sfnt_off00010646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10646 10568 bytes
SHA-256: 7cb8d9fd6640bd48b7ad2d3f1ca2cd658b1f68ed99b361f1c905ed8de96843a0

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