Malicious PDF — malware analysis report

Static analysis result for SHA-256 8377560b27aa9aac…

MALICIOUS

PDF

70.4 KB Created: 2020-12-07 10:18:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 82da153179190211fe4ed5bbfbb70515 SHA-1: 3dc5abb27fcca7ccbb67bcb3f379df258d6adb4e SHA-256: 8377560b27aa9aacfb1c2553aed805e4f730e7d6d5a549f577798d51bf785127
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with one pointing to 'trafffi.ru', suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards a malicious document designed to redirect users to potentially harmful content.

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://trafffi.ru/strik?utm_term=kansas+state+fair+2019+map PDF link annotation
    • https://sasepanubur.weebly.com/uploads/1/3/4/6/134600976/cc739.pdfIn PDF document text
    • https://buwirudoxux.weebly.com/uploads/1/3/4/5/134597973/6999104.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://s3.amazonaws.com/remufuzu/unlawful_detainer_answer_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcfde70d-ea06-4012-8c00-640669afbd55/fight_autism_and_win.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f2016b9-61a1-4b44-b746-8424bf4eb4dd/2505824456.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/stalking_jack_the_ripper_vk.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/francesco_redi_experiment_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0fbae75-86b6-4607-bef9-735373c4fdb4/tezokifo.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/diorite_formation_environment.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/tolop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93901548-029b-4c72-9500-9fbc8442cd4e/storage_room_a2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7565c0-65a4-41e0-a3ea-8d6fe369ec1d/55832806181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f77f874-5cbe-4c59-b470-bdd261e749b2/78524764747.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_off0000c9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9ED 5144 bytes
SHA-256: ef9ff37b6e299d1142618eb66cf4a4d7e5b2874e57bda5dabfc4e609a5947b2a
font_01_sfnt_off0000db47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB47 10648 bytes
SHA-256: 53e61df6ea5bb4b7bad89816b556fb64d75162800b964c423dbbff8d1d6ef6ca
font_02_sfnt_off0000fed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED2 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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