Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f8d4a3617edf3c…

MALICIOUS

PDF

76.1 KB Created: 2021-03-23 12:02:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 526310f2a1b9415630e88e643c8f0d01 SHA-1: 5a71f0f9799584c9345978cf059fc908be90e690 SHA-256: b2f8d4a3617edf3c4fa9568bbec03399e84c6fb3c098cc41ed096f0511cbed53
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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://golowaki.ru/123?utm_term=fussball+manager+spiele+kostenlos+en+vollversion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494431/normal_602d2abfbe7d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406213/normal_6009d94d31a2f.pdfIn PDF document text
    • https://cdn.sqhk.co/rogumabutur/hdMAO4w/sheetz_cresaptown_md.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_604d8bc6022d2.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/FhjajbC/20587391260.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392474/normal_60062d91e7835.pdfIn PDF document text
    • https://cdn.sqhk.co/jupufopil/ccybqhg/microsoft_office_for_macbook_air_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450634/normal_5fd2d09c0488b.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/RmjaHno/earthlink_fiber_internet_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/bitubebo/2EOhOhf/lonovesidupufo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_cd3926b58f7a4e578199736fc2735240.pdf?index=trueIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_c585262994144652a8b95387cdefbe7c.pdf?index=trueIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_0661f0d3e5f14d0183249d4c504671ce.pdf?index=trueIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_da782658d9c0479ca982d18e3a2d4e81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d82ac44-09a7-4bef-9938-e620a390959c/bodyweight_training_program_for_mass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d5b913-f5bc-4b35-a6ea-74a6e4964eeb/28708398755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1405bbdd-3304-4d1c-9941-f197ac4ed06e/topology_munkres_solutions_chapter_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/840684a9-3752-44ed-9bec-46bcc9e66295/cisco_packet_tracer_router_cli_commands.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_off0000ea20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 5360 bytes
SHA-256: 57adfbeb328ac2f3038dff7df3d409b8ceb324afe53dd45795154efa7b63de8a
font_01_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 11756 bytes
SHA-256: aeb20b27489e11dc4d85a36d44ada27580c0e3a08bc210683c07765fc8fdd8c6

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