Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e4036c4ea490a8…

MALICIOUS

PDF

68.3 KB Created: 2021-03-06 12:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 15b7514317e25b943ca5d10fe20c617a SHA-1: 01958564d60884d47fefcc0725e5916148e4b9a0 SHA-256: f1e4036c4ea490a8c56e99fee2a6e6807539eb751c2a7fc674d8ed6498cc9ba5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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://ponafet.ru/123?utm_term=dell+monitor+model+2407wfp+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402712/normal_5ff7b19b74480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479715/normal_60407fa102479.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463262/normal_5fe19829a6ddd.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/gEKwjbe/zarogenide.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/gcidhii/emergency_kit_food_items.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/jdMifha/67877692626.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_56dc2971bd3b46489544de94541513f0.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_e54e2e35f3d6413480f9dc192104a974.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e4c8b4-99d2-43c1-8a98-80f4fc699f13/financial_research_proposal_example.pdfIn PDF document text
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_3b442549001a419389befe2bfc98402f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9de23651-99bb-4d0e-83d4-283e0da83272/how_to_use_symbolism_in_writing.pdfIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_24b1250f46e442f68834fdf642870d3d.pdf?index=trueIn PDF document text
    • http://gemawinikifiv.myartsonline.com/programming_stanley_garage_door_opener_keypad.pdfIn PDF document text
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_608bdae60fa74a5b88bfe194209607bd.pdf?index=trueIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_dbb535dcb8914f9098f3ab6b87c5d789.pdf?index=trueIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/how_to_remove_splat_hair_color_from_skin.pdfIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_7c060943da9b472a8b9f4c6bd88a86c5.pdf?index=trueIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_03c4f60c81f84d4095ae09acc513763c.pdf?index=trueIn 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_off0000cb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB64 5544 bytes
SHA-256: 72ce889c6a7351ad6bf5855d99398ac311387185de8083b2d0fe3389d57c2216
font_01_sfnt_off0000de4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4F 11284 bytes
SHA-256: bbbf859bf301621b4ea345f659481f8c660b0b28187dab6f5336106ea28fa676

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