Malicious PDF — malware analysis report

Static analysis result for SHA-256 f638bb4e1f9c882e…

MALICIOUS

PDF

67.4 KB Created: 2020-12-27 19:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eabbed3f37f45209838bf910067ce747 SHA-1: dbc7f2f5ec829166ea2181a9ec712ae5a07d2902 SHA-256: f638bb4e1f9c882e3e38a1ba06b9b6b367726eb1ff6521254316f97f3a7b83d9
96 Risk Score

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 URL that leads to a domain associated with malicious activity. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and references 'classic video games sound', likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=classic+video+games+sound
    • https://davobudo.weebly.com/uploads/1/3/4/4/134432622/xukanawosej_wemitokewilevu.pdf
    • https://cdn.sqhk.co/vuzefegevo/jh7jaLe/eternity_warriors_4_offline_mod.pdf
    • https://cdn.sqhk.co/jigidokasaga/ji7jjhf/td_bank_transfer_money_from_us_to_canada.pdf
    • https://junipupupu.weebly.com/uploads/1/3/4/7/134739756/sekutoton.pdf
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/jawemepuwiwifisuluf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sojaxub/tunuvegi.pdf
    • https://uploads.strikinglycdn.com/files/5e9c8835-5f71-4de7-a601-8b0ce274bd1d/nikegejava.pdf
    • https://uploads.strikinglycdn.com/files/cb961ed7-91bf-4bea-ae10-d890eb1d515d/pofipig.pdf
    • https://uploads.strikinglycdn.com/files/e74df40e-5d83-442f-b24d-b37805aa87f6/fasifubevabakepolegi.pdf
    • https://s3.amazonaws.com/zuwimadaneb/ximitojomafawepurivoniwu.pdf
    • https://s3.amazonaws.com/dakebesuvum/crayfish_dissection_worksheet_answer.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_off0000cd27.bin
16571137c22daf4adf146823bb7d29a8eeef70a3cbcc85662140d2533a3e50d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD27 5128 bytes
font_01_sfnt_off0000de8a.bin
300fbf90b11cb79448fe0ff42838f44d8f7278dff0de3df034a340d912d09c18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8A 10112 bytes

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