Malicious PDF — malware analysis report

Static analysis result for SHA-256 524aed41c32bf040…

MALICIOUS

PDF

70.9 KB Created: 2020-12-11 19:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac4868e53fbf11cd6366e52d44b53da2 SHA-1: d19f76cdaa7e048bb39127a8d1f1ad7730e340d1 SHA-256: 524aed41c32bf040a716cad882965079c59ac9f37abc1fa0ceb370cbabfbc957
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL that, when visited, likely leads to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to a 'UK address database free'.

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/aws?utm_term=uk+address+database+free
    • https://cdn-cms.f-static.net/uploads/4369327/normal_5fa821615cb19.pdf
    • https://cdn-cms.f-static.net/uploads/4369936/normal_5f8ba99267fb8.pdf
    • https://cdn-cms.f-static.net/uploads/4425255/normal_5fc0d5c04f74a.pdf
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5fb28f7958b5e.pdf
    • https://cdn-cms.f-static.net/uploads/4383308/normal_5fbc756a68091.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/febopa/airtel_recharge_app_uptodown.pdf
    • https://uploads.strikinglycdn.com/files/dca4f509-958e-452f-9668-4dab007f27d4/ginger_teen_porn.pdf
    • https://uploads.strikinglycdn.com/files/644a6f42-1df7-4955-ad0a-45feefbe4d97/pokemon_cards_gx_legendary_images.pdf
    • https://s3.amazonaws.com/jaburirarov/thich_nhat_hanh_espaol.pdf
    • https://static1.squarespace.com/static/5fc58cd0085bf90c0e1cb067/t/5fcc8b21d235d37878bfcb2b/1607240482634/shelter_insurance_home_office_jobs.pdf
    • https://s3.amazonaws.com/jamokaroxoj/cardiothoracic_surgery_textbook.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_off0000d501.bin
afd4eb78ceb7614059a143ec289fd36b94f15723b67a74b01ab40b33ec8e9b35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 5064 bytes
font_01_sfnt_off0000e64c.bin
00ab7fcf8f6a48cbd463343374c34e3be6329eff168f2c826247714e5da520c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE64C 11680 bytes

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