Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd678e6b51a5aeb9…

MALICIOUS

PDF

62.5 KB Created: 2020-11-10 14:18:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7163a13d67d407aa83dd80fe52c62c36 SHA-1: 9d85142b61a57438042ac6006a292be80069837a SHA-256: cd678e6b51a5aeb9b29944d45ecf564e810f31ac52fab7f569d2ffdd46133392
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'interesting things in English'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/strik?keyword=que+es+interesante+en+ingles PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459654/normal_5faa6f02202b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_5f9ae9bf34ba6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420449/normal_5f98918fde533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_5f8b62df640aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446790/normal_5fa7702cbd424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380545/normal_5f9b153e81288.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408721/normal_5fa0f71cd2812.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/841ddabf-eebd-41ef-8f99-8745f97ee706/turabian_kate_a_manual_for_writers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e8d8968-b171-4adc-a977-7360a07d3591/72593190056.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/technique_cookware_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa49b56e-5bc5-40b7-80f3-2047274a7bd0/98478692158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f616ba-7e4d-4b3f-9d94-ab7d0ffcda9c/520975029.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/fumerenokilik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd3ba46-6347-411c-99ee-eec0a59a78c6/physics_walker_4th_edition_solutions.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_off0000b7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FC 4912 bytes
SHA-256: 17e4eec6e10283296a15bcad9d0f70f4ea8f589247fa7b95a97233b90e8ed9d9
font_01_sfnt_off0000c8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 10748 bytes
SHA-256: 5a31afecb237647b893205204b149a770c410b6be577934edd5cd5c09eaf8ddc

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