Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd234129a702551…

MALICIOUS

PDF

108.0 KB Created: 2021-04-15 20:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 042a48bee06356a36a233d9c0ba876a6 SHA-1: 54e9ed26f8c392692a92aaa03e7a44891dd1f4a8 SHA-256: 9bd234129a702551759121c0b7d5fbc7404c8e94f27f89a04c789d2038a3a4aa
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://kuzutuzo.ru/strik?utm_term=how+common+are+brindle+dachshunds PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376598/normal_5fdd85452180e.pdfIn PDF document text
    • https://cdn.sqhk.co/zerumowo/shiGibZ/android_tv_box_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/xesofosirija/hggSpdN/1843317459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496580/normal_602d20f74445a.pdfIn PDF document text
    • https://cdn.sqhk.co/livulopo/ifjehfL/warframe_limbo_prime_blueprint_price.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/purawuma/43990013526.pdfIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_cafdb81f7fe546018c3c712c11186796.pdf?index=trueIn PDF document text
    • https://aa4a64a1-c69a-4176-9ab9-82648dcabbba.filesusr.com/ugd/70701b_aab249f1001b4f649e3973752fd4233d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b77481-3d34-40db-ba63-5515c2d0af8d/welulerobokugarujegezufes.pdfIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_aa0e738aede04026bc096a836af89243.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b39bb380-be70-42cb-a940-6e68d737a3a7/34315836896.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/29042856853.pdfIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_bbe3bdf0876a4f39845e391e8ae9e993.pdf?index=trueIn PDF document text
    • https://c75ed97e-f406-4d79-b864-c99612e64be8.filesusr.com/ugd/a66d15_94996d346b9d4867b8529ead03a3a9c4.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_9036803853ee43039aad3c919953754d.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000167f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167F8 5372 bytes
SHA-256: a7f81f64d20cc9ef6aed1379f05f7f0a74d81ba4883c1364fbc266bf362caad0
font_01_sfnt_off00017a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A16 11500 bytes
SHA-256: f2c7a2af9c35771b4f2989d4f66f32a0abae42226b0cdaeda4c294f74c66ed91

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