Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f081fd50df256f0…

MALICIOUS

PDF

74.3 KB Created: 2021-02-25 02:04:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0d49f9d9eb42c1077e1c67f7816a5d0d SHA-1: 22e1ab128eb78b74b36151ee0509d4480c09f208 SHA-256: 0f081fd50df256f0bd9666b12cca0a1f43c3ca5db83c8f9ad26f929aec299504
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to other PDF documents hosted on disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ClamAV detection and ML classifier also strongly suggest malicious intent. The primary purpose appears to be SEO manipulation or distributing further malicious content through these linked PDFs.

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://baarspo.ru/award?keyword=how+to+write+essays+for+university PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484814/normal_6025cf87b76e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464330/normal_601b3efbe41b5.pdfIn PDF document text
    • https://molireju.weebly.com/uploads/1/3/4/6/134630509/mevewefu.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/hjjQji4/65474337679.pdfIn PDF document text
    • https://wufomuwu.weebly.com/uploads/1/3/0/9/130969972/durabavareto-xenizumapeduver-rimuvufiruwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474980/normal_601511f89b70d.pdfIn PDF document text
    • https://dutizadip.weebly.com/uploads/1/3/4/8/134889078/vaxulaluvamud.pdfIn PDF document text
    • http://biomaniix.website/samsung_washing_machine_repair_servicebqqyx.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/0ggSihn/best_table_tennis_racket_butterfly.pdfIn PDF document text
    • http://shopee24.site/active_listening_skills_exercisesjaubq.pdfIn PDF document text
    • http://reliables.ru/incoming_material_inspection_reportxp4gg.pdfIn PDF document text
    • https://cdn.sqhk.co/fegujajox/c8gjpKL/23013384832.pdfIn PDF document text
    • https://cdn.sqhk.co/bibolaned/Iign5T7/super_bomberman_r_online_stadia.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/apOjhZc/football_pixel_art_minecraft_download.pdfIn PDF document text
    • http://detonic-shop.website/nopamogprkx.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/ghVjejc/okc_thunder_coach_news.pdfIn PDF document text
    • https://zalogarigi.weebly.com/uploads/1/3/2/6/132695681/volejileba-vukifizilinube.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 4944 bytes
SHA-256: c0600daea29d2964d2b413fdbaec4aea54ec79b0558dbe500b1ee1b569ecdbd4
font_01_sfnt_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 9996 bytes
SHA-256: 9998f539713506558186221ef3ed9acd429b67e9304a4bf54dc1410f7414cf04

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