Malicious PDF — malware analysis report

Static analysis result for SHA-256 f121d74297e09f47…

MALICIOUS

PDF

70.9 KB Created: 2021-01-02 08:28:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ffd908c36c47f4cd34c0319ef0b226d5 SHA-1: ef4ca3fefb32dbbf2b2267c1d6d2f053baa4ea0a SHA-256: f121d74297e09f47c1764ecdc22990647f17526761aa22594349f304d62f1e24
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, with one pointing to 'https://trafftec.ru/123?utm_term=torque+wrench+rental+singapore'. This pattern is often used for SEO manipulation or to distribute further malicious content, aligning with a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=torque+wrench+rental+singapore PDF link annotation
    • https://kafowuvipuv.weebly.com/uploads/1/3/4/3/134337110/1702501.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/5e7cce8c6.pdfIn PDF document text
    • https://cdn.sqhk.co/womibakok/vhahhie/skateboard_tricks_hard.pdfIn PDF document text
    • https://moginirem.weebly.com/uploads/1/3/4/7/134769545/8c830a6bcd4218.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/5f68ae25-b850-4e3d-80c9-b70f3eb91f04/79896633668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59c9a57a-6e5b-4077-b21f-da65058a8239/bufarorotoduravemovapamun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/231638b9-bcda-4dce-81f6-7891773bf04b/34963742162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5ec2be7-b9ae-4fdb-bb94-807d4c02441b/99647489118.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/malinowski_argonauts_of_the_western_pacific.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a0458fb-a6ef-49eb-95b3-14147a1a804e/80506031156.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/air_and_noise_pollution_control.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_off0000d805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD805 5364 bytes
SHA-256: d82eaeafa3577529068bff68500c3604ab89b8917dbe29c94e94f6107138ea89
font_01_sfnt_off0000ea51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 10956 bytes
SHA-256: 4d48d3c2718e7c893696726f170dad02837ffb324b3d76de9b62df2dd1baea34

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