Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd7db81650f41a2…

MALICIOUS

PDF

77.7 KB Created: 2021-03-18 23:22:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ca3916c3b91c3fd810cd0e80f3ddaa0c SHA-1: 547e8a8180573029a836e886a4d00d2237d9b87f SHA-256: bcd7db81650f41a25306df1b893a61c8b23c529380d03876f7d6da5c3a966d72
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=graph+paper+multiplication+worksheets PDF link annotation
    • https://cdn.sqhk.co/pozusonitid/jc06hcc/dash_till_puff_2_all_levels.pdfIn PDF document text
    • https://cdn.sqhk.co/guregame/ifHWhdy/margherita_pepperoni_stick_nutrition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419644/normal_6023c9243c78c.pdfIn PDF document text
    • https://cdn.sqhk.co/daladovum/eCU06sg/tripp_trapp_baby_set_grey.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369802/normal_6032e2491bc1f.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/hCgcYje/64142534256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_5feaeb9328da2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402960/normal_600601260032c.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/cibgegc/16576325965.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/jjgicYt/waratonibiraduzegokatef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_9627c8249b4746fcb58acdb402131723.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/699647bf-ef9c-455c-a92a-7826812146ec/aircraft_maintenance_engineer.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_e4961ab1a80b4a4a9f360faa3866c278.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35c6eb1f-91ff-4633-b909-9a8c14be1021/the_maze_runner_1_movie_summary.pdfIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_fddd2bf5193d453689832162081dda9b.pdf?index=trueIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_625c796b0fb542fb96985ee7c71a49b1.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_4baa15333e6d4ea6bff6f1fc3bf12448.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_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 5360 bytes
SHA-256: bc7866ea9afee2fe0ff875ab5b1ad5b3fb07b0c20e4cc219d9df06b69739654c
font_01_sfnt_off00010409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 10612 bytes
SHA-256: 83be0ed08a6ec6e963c2662b5fc92af3f4a40dc3319dfaef453ee215acfd20da

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