Malicious PDF — malware analysis report

Static analysis result for SHA-256 423687e15111bab3…

MALICIOUS

PDF

64.5 KB Created: 2020-12-16 07:42:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bff2426930696cd22b87238fa09e4ef7 SHA-1: e327fc4bde9e4a83009267afa2c9735f593414c0 SHA-256: 423687e15111bab31763ac29d70d2bc5355362eba554f367b39e61f35070a92c
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to mislead users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a redirector URL further supports the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/wb?keyword=spider%20man%203%20psp%20game In PDF document text
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/846723.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493553/normal_5fc5a2e8bd9ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426813/normal_5fbb47cf0a2be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_5f88a20eb783f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_5fd84cbcac262.pdfIn PDF document text
    • https://mixofugu.weebly.com/uploads/1/3/4/3/134351041/damunoterepagojizug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379053/normal_5f927e1580349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_5f992450b4350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419430/normal_5fa6b79c4a3ca.pdfIn PDF document text
    • https://dupasaku.weebly.com/uploads/1/3/4/2/134235895/vutevu-luwadufobod-pezojupe.pdfIn PDF document text
    • https://rugalasaludazi.weebly.com/uploads/1/3/4/6/134683923/xetuwotolekesu_vadudevinizev_fepakop_nerazevamokal.pdfIn PDF document text
    • https://sopoxovolofu.weebly.com/uploads/1/3/4/5/134509961/845bf40b0.pdfIn PDF document text
    • https://mowofagafuvu.weebly.com/uploads/1/3/4/5/134594922/204f4c1b8ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc707bf717a0f60c4010a14/t/5fd02ec0a4b4ef2db69d4be9/1607478979829/jasekuwabokavozidag.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_off0000bf79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF79 5516 bytes
SHA-256: 49f9ccf6914a5b93ece21eabb1f205a9f335e48cfba4ec2aa61ac4a40622c8e5
font_01_sfnt_off0000d217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD217 10316 bytes
SHA-256: 1f5923710c2821bc2bd6448817159c3e3131c8f76f09e8bfc578422e050c2180

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