Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fbfc396521011f…

MALICIOUS

PDF

66.2 KB Created: 2020-12-01 03:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7550c76f266bf3424737fab625400fda SHA-1: 9ce3529238c13eff0f6e406b69f49c7d99e1eed2 SHA-256: 28fbfc396521011f624ba00644746828e0a4a401ffd3a3ce856138b798acfd0e
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL pointing to 'trafffe.ru', which is likely used to redirect the user to a malicious site. The document body appears to be corrupted or heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the malicious URL and the detection signatures strongly indicate a phishing or malware distribution 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://trafffe.ru/123?utm_term=nasm+essentials+of+personal+fitness+training+4th+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404299/normal_5f956d32a76b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377128/normal_5f8cc55707ef2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f906b99d9db3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458431/normal_5fb2ad7e3718b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460449/normal_5fa5388541e24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464314/normal_5fa237d0230c1.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/5fbce344be7cfc36344e8aaf/t/5fbcfae98bc8713fe6fda201/1606220522530/all_are_welcome_haugen_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/799f8d24-2ae9-4398-965c-6c653562adff/wiwalupuretudadezef.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc016b9c30a162e0c4e17a3/t/5fc52143fa04221c71c40c39/1606754628126/xujubixatukuka.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfceb2c14dfd36feeb11ef/t/5fc0eb323c02f22b9d2eb7f6/1606478642033/78604331148.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf64183c02f22b9d054675/1606378524821/overnight_lean_keto_and_apple_cider_vinegar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a956d973-7581-4dd5-9190-c876a635aec6/2844059866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ee9a6b-a581-4cf3-b6e4-31cde027a088/tuxix.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC566 5512 bytes
SHA-256: 2151f4539cad07f67df21c9f8c69ea0affac6505d2697a40e01d7ae60d7d95e7
font_01_sfnt_off0000d805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD805 10408 bytes
SHA-256: ee1b143a6522a364032023e1616a0bb633c5136bc65f81411ea94a1987810ffb

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