Malicious PDF — malware analysis report

Static analysis result for SHA-256 27af8d7b0b73427e…

MALICIOUS

PDF

65.9 KB Created: 2020-12-26 04:24:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23f5b5bb3c27ae8b25142a9089098af5 SHA-1: 18034985e6338801744582b3626997a5ae81d7e0 SHA-256: 27af8d7b0b73427e2fca58b80ac17ee186e81f9acd63c58f97574fd0bfe5fdaf
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing purposes. ClamAV and an ML classifier flagged this PDF as malicious, indicating a high likelihood of malicious intent. The document body, though partially corrupted, suggests a lure related to a student workbook.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=trail+guide+to+the+body+student+workbook
    • https://cdn-cms.f-static.net/uploads/4449192/normal_5fd38e32063a9.pdf
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5f9c213b9b996.pdf
    • https://cdn-cms.f-static.net/uploads/4455658/normal_5fab96a41019e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zetare/wikodizopolilisa.pdf
    • https://uploads.strikinglycdn.com/files/c6e57994-1c88-46cb-bf2a-1d61fd7dd605/pudifigoro.pdf
    • https://s3.amazonaws.com/woxotopapozokev/31988353821.pdf
    • https://uploads.strikinglycdn.com/files/43714743-b5e5-4c67-83be-08f10548b234/guide_bucheron_dofus_1._29.pdf
    • https://s3.amazonaws.com/gupisi/medical_department_scp_logo.pdf
    • https://s3.amazonaws.com/suzeduselu/gobozumuduwuzoxisafiziz.pdf
    • https://s3.amazonaws.com/vavejijitatofu/55097676689.pdf
    • https://s3.amazonaws.com/bezorito/kabavofafikefazezor.pdf
    • https://s3.amazonaws.com/fasanag/semalunujifuvox.pdf
    • https://s3.amazonaws.com/welanisowari/aeneid_summary.pdf
    • https://s3.amazonaws.com/mujesogi/tomulonuguku.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c455.bin
6a524c301feb6f1c7a2ecba91f5612c3a850e6f1c9ca3894f7b53b181cc157c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC455 5432 bytes
font_01_sfnt_off0000d6da.bin
9f987d31179e6d744ef0cc3f2d1a717039f47ba1f07c2c35cf2ce0433adbb84d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 10536 bytes

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