Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b50970eb2b0d23…

MALICIOUS

PDF

66.2 KB Created: 2020-11-24 20:20:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7c1bcdeeefd4d6c26b7f65e7ae100ead SHA-1: 1ae138b33414e5ae90db7eebcc65445a6cae74dc SHA-256: 80b50970eb2b0d236a0224ce8df232b2f331e94e5c94f4edd97ada3f5b47c8e5
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The presence of numerous embedded links, many hosted on disposable domains, suggests a link farm designed to funnel users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier output strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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://traffmen.ru/123?utm_term=frayer+model+template+google+docs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_5f8e41b755c31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370530/normal_5fb4b5f3852a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416319/normal_5fa1066055388.pdfIn PDF document text
    • https://vovejurumek.weebly.com/uploads/1/3/4/6/134644047/81526b3b.pdfIn PDF document text
    • https://radelemetiwiwi.weebly.com/uploads/1/3/4/5/134520029/kirasijirikapufol.pdfIn PDF document text
    • https://zuragani.weebly.com/uploads/1/3/1/4/131438510/misokif.pdfIn PDF document text
    • https://tekadepaja.weebly.com/uploads/1/3/4/3/134341299/zepuw.pdfIn PDF document text
    • https://zotolujirerezo.weebly.com/uploads/1/3/4/5/134582396/wabepirutojulora.pdfIn PDF document text
    • https://zefufewik.weebly.com/uploads/1/3/4/3/134374544/26ed4.pdfIn PDF document text
    • https://sigozebuxofiko.weebly.com/uploads/1/3/4/3/134372047/2146866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461786/normal_5fac5945605ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_5fae8730f1825.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/1423781.pdfIn PDF document text
    • https://jorokepevi.weebly.com/uploads/1/3/4/6/134688072/latazadagadu.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/vebogotexaf/visual_ergonomics_in_the_workplace.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_off0000c624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC624 5452 bytes
SHA-256: 1d6398d104438c9f89b06259f3504fbbb1dfe5ec172ee3b7d97959d0440a97c8
font_01_sfnt_off0000d8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A4 10312 bytes
SHA-256: 812ebd96fd91fc474c1bb05f9f6cee44995cb8da222669ac27372cf8ec162197

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