Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b7978bc80e1223…

MALICIOUS

PDF

76.6 KB Created: 2020-12-18 19:57:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d3824b402604f4cda4edfed9b369d8e1 SHA-1: 2b6f7a87b8578dd59b0036bc7a11c0e427a32f9f SHA-256: 83b7978bc80e1223a9ee3202e150deb0c89be5de64ca8bd2561ee942d215e8bd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://trafffe.ru/123?utm_term=db10+guide+reddit', is flagged as unknown reputation, suggesting a malicious intent to redirect users. ClamAV and ML classifiers also identified this PDF as malicious, likely phishing or a trojan. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffe.ru/123?utm_term=db10+guide+reddit PDF link annotation
    • https://zanasebumafuwaj.weebly.com/uploads/1/3/4/8/134899829/nomudekutow_movudawu_xugexakilitijix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8f4eea2-b5b4-4756-aeb6-f656a6d6499a/37741778631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b9bb3d7-d2d2-4f40-ac72-6a24ab61b82a/skyrim_civil_war_warband.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c640057-df4b-4f61-a1b8-6665cf9b93c4/ragupamowav.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/video_burung_cendrawasih_menari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b27179ff-a658-4d58-9e83-23e8b5838e53/popular_mechanics_magazine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a9bfef-98ea-4d1e-a81f-523643ffbd65/the_missing_piece_shel_silverstein_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/welutizenop/radiant_raiment_skyrim.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5a8f52bbd74065826fdfd/t/5fc8e98fb5c0dd03ebd2e7ae/1607002511980/87794312916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6790f51d-cc51-40de-8f73-4e83d99b9724/the_allyn_and_bacon_guide_to_writing_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c50931f-30db-442f-a72e-ffe5607761bf/alera_elusion_series_mesh_high-back_multifunction_chair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7814e7da-34d7-4c71-8cc2-9840c7f330dd/77950961357.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_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 4908 bytes
SHA-256: 13cdf2c02eacbbcae1d143826ef5f02b3dd8e3bebb249c01d57079f62983b48c
font_01_sfnt_off000100a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 10992 bytes
SHA-256: 5a70c7ae59d4ecf8904f029a67229dd88dce5494446080ad0cb2da6a77e4927e

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