Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d9052b0ca55eaa…

MALICIOUS

PDF

62.3 KB Created: 2020-12-11 04:24:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e1f6d4f94d4ea2d921c2553d75640b4a SHA-1: 6eab08f066ad2874a387515932676c0b3862e91f SHA-256: 94d9052b0ca55eaa8a45e85c124d7a178bad46053b88e517027c062819857783
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards malicious intent, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/aws?utm_term=distinguishing+between+atoms+4.+3+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5f9cb4e1ed210.pdfIn PDF document text
    • https://vavetoros.weebly.com/uploads/1/3/4/8/134854671/e75179a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_5f8edba0db197.pdfIn PDF document text
    • https://zikixitifo.weebly.com/uploads/1/3/4/8/134897390/buwozilupe.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/70ebaf85-ad5e-421e-abb3-348949d8ae76/56027072206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4426b6c7-66c3-4bb5-af01-0fe21fefa2ba/30963200303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c353d283-2d86-49d0-aff6-5ee163c02dd1/zororidowatezorefir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d13f14d7-3428-4cbc-a4e0-1c38a7d0d51e/90722646937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/958ae08f-b3c2-4cb4-8384-2e44383334a5/84142529073.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/photo_editing_camera_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685bba97-17b8-44f1-a7a5-09dd5f11dd62/fofomuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e57f49d-85a6-44a3-a6f6-93fe116e1f2e/63541053299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a41e4da-1ff0-4ac3-bdab-54a1df838f6e/mawazuwogiwiwutebonevuni.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_off0000b849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB849 5580 bytes
SHA-256: f7b641750e26a186d8c9996b97b31a4411b810c655276ea27ce8a07d3154eb02
font_01_sfnt_off0000cb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3E 9764 bytes
SHA-256: 59014e423fcaa4849088a1e11d4fb8b72d160c3bfa2e239bcda5ace185c2beda

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