Malicious PDF — malware analysis report

Static analysis result for SHA-256 df44435b8b5b40ce…

MALICIOUS

PDF

67.9 KB Created: 2020-11-18 22:26:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b4f0fe657841d777e49b3b39bc9e67a1 SHA-1: 97196fb19c0d1a5593520b2b2ecf5cac99b52ee3 SHA-256: df44435b8b5b40cebd1f7395fc4bc80467adbdc99bca1d8054027ed53775193c
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified as malicious by ClamAV and a machine learning classifier. The document body, though heavily obfuscated, appears to reference an 'Onkyo sks-ht540 7.1 manual', suggesting a lure to trick users into clicking the malicious link. No scripts were extracted, but the presence of an external URI and the high confidence scores from detection engines indicate a phishing attempt.

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://traffine.ru/123?utm_term=onkyo+sks-ht540+7.1+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415055/normal_5f9ad554f0a29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369900/normal_5fa757d209ab2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417536/normal_5fb4e010cf7af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5f88d7dc2b3b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368237/normal_5f8ae600c415f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_5f9fe2e363c4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375704/normal_5f8ba07d2c69f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447631/normal_5fa1cf826ac10.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/24a0d69a-8a9a-4c2c-b338-4308a03ccef3/rixalugarevaloba.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/26766962999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76fd6dbc-6f0c-4ffd-92b2-a2ebe12ebe0b/gonifodapilam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b39d70a-4805-4e76-8cd1-bccae2bfaf3b/creed_six_feet_from_the_edge_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/39627723097.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_off0000bcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBC 3012 bytes
SHA-256: fa55d17ea6d76b51f5840468c2d134341d13d19ef7ae323d2da6d356f386be5b
font_01_sfnt_off0000c78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78D 5572 bytes
SHA-256: b79496ad3b0976c54e3cf211b7a7c6bab765906111e55f42595764a0a8a13272
font_02_sfnt_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 11488 bytes
SHA-256: 14b1745701cbd8a344d12be829e09ce0be0964174c8f5881d87609753999660e

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