Malicious PDF — malware analysis report

Static analysis result for SHA-256 495fcba7a913b23d…

MALICIOUS

PDF

70.2 KB Created: 2021-03-20 08:26:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2b754323f8c1e0686cac3ff85590efdc SHA-1: c8f6bda20b44aa6ec3d3818db2eab0237afb6c97 SHA-256: 495fcba7a913b23da58ed93c6d83f1576580d75af5afd748b6ace3b9433f87a3
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to other PDF files, many hosted on disposable domains. This technique is often used for SEO manipulation or to distribute further malicious payloads.

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://vilenefex.ru/award?keyword=design+sprint+book+pdf+download PDF link annotation
    • https://najigojuvunijo.weebly.com/uploads/1/3/0/8/130874658/tanaxokidotupos-lusipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_604d8221748da.pdfIn PDF document text
    • http://fabikaj.iblogger.org/altivar_320_manuale_programmazione.pdfIn PDF document text
    • https://sebimifovuduga.weebly.com/uploads/1/3/5/2/135298708/pomidik.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/7979575.pdfIn PDF document text
    • https://favobilumosuxo.weebly.com/uploads/1/3/4/7/134733594/5609054.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483349/normal_5fc9dc603ff57.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/serekaxopireribik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470537/normal_600b63779d6a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474734/normal_6055387005077.pdfIn PDF document text
    • https://duluvozega.weebly.com/uploads/1/3/5/3/135327827/3925874.pdfIn PDF document text
    • http://dozixolabizije.iblogger.org/57104709835.pdfIn PDF document text
    • https://nenejiremox.weebly.com/uploads/1/3/0/9/130969141/beguturukorewe-guguzes-tomifikoze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380545/normal_60325a19711df.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/ruzumeb/haccp_iso_22000_fssc_22000.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/92638898117.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/7360090014.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/wujalasixa.pdfIn PDF document text
    • http://jilasig.epizy.com/cutting_edge_intermediate_teacher_s_resource_book.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_off0000d419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD419 5504 bytes
SHA-256: 21b4ff4cdcfc691aee208af5bd242d0f04ff8c6ddaac9a8f1e8980d0e08dda91
font_01_sfnt_off0000e6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F8 10276 bytes
SHA-256: 597edf7dc194a67cb58ee865075805f225b9ad32442a7b5ca04dbd67803bb776

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