Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f309f0364bc70d…

MALICIOUS

PDF

70.1 KB Created: 2020-11-25 20:51:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b6f20d1d19fab5ad7f74ba80f0aed322 SHA-1: e9f7dabb8b288d220e1f7bf39a5f0728aae045c0 SHA-256: 73f309f0364bc70ddb3d6062a36ea3f13cc63cdf453388252e1849afd4c5aef5
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to 'trafftec.ru'. This URL is presented in the document body as a lure for a '32gb flash drive bulk' offer. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of an external URI is a primary indicator of compromise.

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
  • 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=32gb+flash+drive+bulk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5f98555dccc7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_5fa50feede9f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5f8cfaf6ea838.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5f8c15a6d5b5b.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/42cfc8f2-c816-49ee-a03a-f056afbc4e2e/tap_drill_hole_size_chart_metric.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11c3e025-296f-4820-996a-60cfd463e2f9/44323132111.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/kudisaruga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de574870-683d-4894-9413-7613f39addf1/the_merck_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d75d0d54-cbb4-459c-b499-a7b4b4dc5cb8/77799905463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae99d75-6e92-4634-8de5-2e4e4ca09270/life_of_pi_chapter_summaries_and_questions_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/851cbd88-bfe3-40b7-90b6-e5177f578e0b/95204923413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99412217-81ff-4090-a317-f38cf802c73f/susabitikovurepoj.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_off0000d55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55E 5636 bytes
SHA-256: dd0df0f7f1f63ad98cf3ef8c025913dff2e1a4d81842a19f812e9b63f1bbe1ba
font_01_sfnt_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 10584 bytes
SHA-256: 36066b321a74563ac21a33bbe225103a9bc439ed7ca7a9116b28844bd8f69043