Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d5e63a3ba8edf6…

MALICIOUS

PDF

75.0 KB Created: 2020-11-23 13:32:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f593523f513bf8437b235db9e20e7de9 SHA-1: f1704c750118945db8f1cd1e98a1f438a506320c SHA-256: 74d5e63a3ba8edf64d9fdde2b6e07579efdca4002e9d0ee3ebedb97bddba3f67
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One of the primary external URLs, 'https://trafftec.ru/aws?utm_term=acknowledgement+notary+format', is directly associated with the document's content, suggesting a phishing or SEO spam lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/aws?utm_term=acknowledgement+notary+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5f8f9f786409e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_5f889cee56799.pdfIn PDF document text
    • https://relitaju.weebly.com/uploads/1/3/4/8/134888942/sujese.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://uploads.strikinglycdn.com/files/4fed85ed-23b9-4032-8ee5-ce08a50f0349/nevoboxitura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a441151-88c7-46fe-9969-94630ea0b5f2/38940153685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69540a3b-b0ea-4083-9217-3a216f61949c/14851096036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf51824a-6cf2-4656-84d4-c5a77118159f/university_of_south_carolina_womens_basketball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/988f075a-053f-444e-af91-e1cdce96577d/49349120612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f3ac515-4e2b-47ab-a6b2-a5984ef6401b/unicef_competency_based_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f942bc44-5dc6-4fe2-9a0c-5db86dd4ba3d/63463323627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4634e4c5-5468-4516-be70-cd0b6083ebd8/22942563608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b5dec7f-0d0d-46ce-b6bb-4681c5731fb5/38231405339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/824d1770-5794-45b4-ba06-250d747908d1/fanagobifiwitojovej.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_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 5152 bytes
SHA-256: ece30878400ebbc7d46576fd5192a46adaf8f61e69f5e22fe833f2d4b31a1cf3
font_01_sfnt_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 10196 bytes
SHA-256: dacb262d1e7258a626a4b2ffc674bd3c09a79fbc00fe1e1c8ad833fe6b2d6329
font_02_sfnt_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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