Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9999c3beef2cfe8…

MALICIOUS

PDF

94.5 KB Created: 2020-12-29 22:44:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c338bf10c43047a41657cc0edea5b515 SHA-1: 1b8cc7a3eb380579af139759e1186d168c653c61 SHA-256: b9999c3beef2cfe86f889edfebb051b46d60f67d974ee990bfbee41ddc22c2d1
156 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous external links, including a primary link to 'traffnew.ru'. Heuristics indicate a PDF link farm and a ML classifier flagged it as malicious. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffnew.ru/123?utm_term=wild+arms+alter+code+f PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473044/normal_5fc762665cf0d.pdfIn PDF document text
    • https://kofusozefo.weebly.com/uploads/1/3/4/5/134515267/32ee902858d7d6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5fb936422c727.pdfIn PDF document text
    • https://cdn.sqhk.co/kosuxatune/cijidig/gerigilewosore.pdfIn PDF document text
    • https://cdn.sqhk.co/dawajimet/VY0YVLJ/drive_ahead_sports_mod_apk_android_1.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/78e6ec46-dac6-4887-a044-47043df7adab/sizesefajutifaxawalasuvan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8701c8ae-f74b-42aa-ad74-461e6e76177b/34434424915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/646c6def-8d79-4c8d-a5d7-e9a25887e9ee/69053719959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5146f884-d2be-4d60-a095-c0949ec2d01e/motutokiluwuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4602852-e829-4a3c-9b53-21b2e6f2c434/zatupupizelog.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_off000123b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B6 5588 bytes
SHA-256: 1206f752984aeee0f8893b8af1474c898fe84e2ffaef3a1af7fd95b9c1fc3cd0
font_01_sfnt_off000136e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E7 5180 bytes
SHA-256: 148b372343c217e286cf070f8bd196d86e94137e77af09872af7e2deb774fc87
font_02_sfnt_off0001487a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1487A 10772 bytes
SHA-256: fdedca4f48a47530c30bbbaa8e27adc5eea6f33fcbbe3e046adb864cb9dddef1

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