Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b35777085ec8bf…

MALICIOUS

PDF

67.4 KB Created: 2020-12-17 22:39:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ed38a984f148b6f24d58fda44ab86749 SHA-1: 536c81a3b30019edeee79f4eeba9ab9085d0532b SHA-256: 17b35777085ec8bfcf68c4c3323915439193cc2a1afe75dde838aefa3b11c350
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'trafffe.ru', which is likely a malicious domain used for phishing or to host a secondary payload. The document body, though heavily obfuscated, suggests a pretext related to legal proceedings, aligning with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?utm_term=cross+examination+questions+for+expert+witness PDF link annotation
    • https://zijananuwale.weebly.com/uploads/1/3/4/4/134438714/mafen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489404/normal_5fd80aec20f5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5da01bda9c57a97e01dc8/t/5fc8992413de6e79815e7bbd/1606981927903/vorebejixubogatilogaxum.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/zepugamadiwegumev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6318e02e-f2ff-4160-87e1-4e2692868fa9/kegos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/960bd8b8-6806-46f1-bcac-e1bab5800107/wibetubak.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/level_6_cheerleading_skills.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe059c2dd96f5918b517b8/1606288796329/keurig_duo_plus_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e4db5e-c0cc-4619-ac62-21f176dac6f3/divisible_by_7_in_python.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/resident_evil_4_ppsspp_cso_file.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52A 5208 bytes
SHA-256: 26cd2caec2803e91fdeed450ef015f67faee8154ad310a8fead6edbab6d98be0
font_01_sfnt_off0000d6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E1 11872 bytes
SHA-256: 49f7ce743b1fc777dfc8d4ef33d81ba809563beeea3d85bf78c55e61885ecc3c

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