Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eed324cedd12f5c…

MALICIOUS

PDF

69.2 KB Created: 2020-11-19 03:17:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1148177cb2115065f5687fa288f45288 SHA-1: 1d9d583e920823da12529ab92e7e1f0bd53a213a SHA-256: 8eed324cedd12f5cd31dfdeb71be3ae550b07b31e8e1c3f57b97fbd361cb5b3a
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing malware. The presence of a 'download' button lure further supports a malicious workflow, though no specific script was extracted to detail its exact function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/123?utm_term=skyrim+mods+xbox+360+download
    • https://vekaluledezo.weebly.com/uploads/1/3/4/2/134235689/womivututo.pdf
    • https://cdn-cms.f-static.net/uploads/4415756/normal_5f94c3a964ed5.pdf
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/maguzadaf_mugiduzowe_xurujeremuveb_kibaxokufafe.pdf
    • https://kuvikupomudu.weebly.com/uploads/1/3/4/4/134457818/rexigokani.pdf
    • https://pawuzoratifeze.weebly.com/uploads/1/3/4/4/134471058/sujoredebakatuwetav.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/ramugimexixepaba.pdf
    • https://cdn-cms.f-static.net/uploads/4501961/normal_5fb5a6b456b1b.pdf
    • https://cdn-cms.f-static.net/uploads/4402745/normal_5fa15d9471bfb.pdf
    • https://debekekuwafa.weebly.com/uploads/1/3/4/4/134473288/50dc991cc53.pdf
    • https://wumudirega.weebly.com/uploads/1/3/4/5/134515906/tenigipubutifop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/95176cd8-e451-4fcb-acf4-73c1f031ca2a/geometry_dash_descargar_para_pc.pdf
    • https://uploads.strikinglycdn.com/files/b45b6bf1-c562-43c5-878b-31f60b0407d7/occupational_health_assessment_form.pdf
    • https://uploads.strikinglycdn.com/files/2ced9c5e-24f1-44bf-900a-18220fe74012/cphq_exam_secrets_study_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cefd.bin
6393cabf369203c676e5b64b4d98a377db0b185a3e5170173fd7f2ac04bf7178
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFD 6000 bytes
font_01_sfnt_off0000e368.bin
5bb2508e16a9abff03381d981b8bff995270d30510e16a00c8900fbf9ea0fe9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE368 10704 bytes