Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c6a1837b14f8e4…

MALICIOUS

PDF

58.0 KB Created: 2020-11-13 05:35:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 30aaf5f37f3036d5c399264492850163 SHA-1: 1a76307c736ff1bc8a5e4d92406ec5ee1d262929 SHA-256: 91c6a1837b14f8e418831deee3aa7201d8aacd33c1a4f54172cd8f0bcb750cd5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to 'traffnew.ru', which is flagged as suspicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing attempt. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution vector.

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://traffnew.ru/123?utm_term=moonlighter+price+guide+reddit PDF link annotation
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/8363686.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/fb5fe4ed-14e9-4e5e-9d76-023ac0b368d7/visozevediladuzutu.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/online_learning_platforms_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb49023-ce8b-459b-a7e2-c2c568d24791/numimirekipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/052ee180-7945-4631-8dea-054d9514b2fc/pedomuwosumotuxujoxidija.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/vuzajijunilitixorutajexet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30ac80e9-19cb-4e3f-b3b0-cc5ec37695b3/56108601851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d7c0f7a-3e3c-4ca5-9f01-4a649d47f915/21712414376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d60da783-142a-46e2-9aee-b91c991a9621/hin_astvacner_levon_shant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ea6f0a-2183-4358-b3e2-7b7acbe3d9c6/hal_lundgren_letter_to_lebron.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0df2220a-9304-40e9-934a-7f39ae9ce3f4/39715519079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea4321c1-34ce-4d10-ba16-c07d1de7c4ec/disruptive_cover_letter_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5daf264f-9026-442a-a9b6-ed59776b4df7/44839398324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b15823db-6c78-4f63-8046-19ab5493d652/30387288043.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_off0000aaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAA5 4952 bytes
SHA-256: 35126a798db9ffbfe5cbf1ed71ed5bb23383e446a8e97fd9c0a8aeddd88f2866
font_01_sfnt_off0000bb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB82 9300 bytes
SHA-256: 79510bc9e67f3879e20fa2c2422face7c60c60bf6e35c94c37c8f1fa440f0c1a

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