Malicious PDF — malware analysis report

Static analysis result for SHA-256 5265ebb58eada294…

MALICIOUS

PDF

74.6 KB Created: 2020-12-11 13:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bb97a4026ca7e9655a7bd3d59f9b50fa SHA-1: 7ddd6c54c29f72a7b2fc246bd9b3ec648935bfb5 SHA-256: 5265ebb58eada294a082a34da18f5c1a8efc7778771aa929f9c1f2a92f596cf8
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL points to 'traffmen.ru', which is flagged as malicious. The ML classifier also strongly suggests maliciousness. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffmen.ru/strik?utm_term=solving+systems+of+linear+equations+graphically+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387819/normal_5fba7230ef352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419846/normal_5fa66bb219dae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368467/normal_5f9b82e5dae2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386829/normal_5fa9bddc2d7db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f87dd82c120b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f887ec98d85f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457014/normal_5fa219ad79747.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/kavitokolezub/vepinesun.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/blackpink_in_your_area_album_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/delco_shooting_supply.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29f54e69-925e-472c-9f59-45880d26b1fc/27917390139.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/gelumasasoz.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/arjun_reddy_movie_hero_hd_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d5d9496-4eb3-4882-b06d-6aa548ef9b53/sennheiser_officerunner_lifter_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/amazarashi_living_dead.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/automotive_repair_order_template.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_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 5976 bytes
SHA-256: e5613caed9282e2bb80898da3a9b94563fbdcbd687117dd26d44ae26274db20c
font_01_sfnt_off0000f99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 10376 bytes
SHA-256: e64c3fe84bc25c232c2e9dfbf659feb43d3f4111b9f690c672b8b5fa981b4474

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