Malicious PDF — malware analysis report

Static analysis result for SHA-256 f334ee6e7fce3086…

MALICIOUS

PDF

70.7 KB Created: 2020-11-12 16:55:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 81fb019546b96327b073842cd3030db1 SHA-1: 20d76f66f28200e61a4e82387bdd50b90187133c SHA-256: f334ee6e7fce3086cb1dfea5dcd455504cd219e1c9e9847fa88208ad8159e803
156 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 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 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.
  • 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://trafftec.ru/strik?utm_term=the+freedom+of+the+city PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368969/normal_5f9375a218f29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5f982e2fb4f76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_5fa905b03b2fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390071/normal_5f8e1bfba596b.pdfIn PDF document text
    • https://pasabegimukug.weebly.com/uploads/1/3/4/2/134265340/risoruzuput-silibireso-vezoxegu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7a488a4d-ae94-4249-ba17-19b1bc84e9cc/91293339969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/981ed95a-6fe1-4565-9d7a-2af7d07d2e51/steve_mcgarrett_e_catherine_rollins.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/tubemate_3_apk_latest_version_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8606b59-54a1-4409-bd49-a557cc3f298a/weliwimusogovaxogewakaw.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/the_flick_annie_baker_monologue.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/google_sites_games_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/samisagof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beb31983-1b0e-4210-81e2-d04986fd7e6e/9206100487.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6E 4576 bytes
SHA-256: 2478fe9b3e8e44f46609086dbf5aad5e2953dfb47aada99e04bef9d7003b50ef
font_01_sfnt_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 10592 bytes
SHA-256: d6913e033c7ce0d1b14ed6836b0dff086d68e43d95b6b126d7ce557a0b0b2ab9
font_02_sfnt_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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