Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4472bc4ee14ff4f…

MALICIOUS

PDF

70.3 KB Created: 2020-12-25 16:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2eb721282a6736cdc50488bee62bc103 SHA-1: 1ca0f6f9d4daa923fbe937a8d7f95495be9de32c SHA-256: a4472bc4ee14ff4f4c60578500a3d081003b538fa3889809490457ff41b7e00e
96 Risk Score
Tags
free-cdn-ebook-manual-lure

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 URI pointing to 'https://trafficel.ru/123?utm_term=yesterday+guitar+tab', which is likely the primary lure. The document body, though heavily obfuscated, suggests a theme related to 'Yesterday guitar tab', indicating a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/123?utm_term=yesterday+guitar+tab PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406170/normal_5fbf2d093c9c0.pdfIn PDF document text
    • https://cdn.sqhk.co/kalijada/RJCgG0p/rotakibisevotazexibopu.pdfIn PDF document text
    • https://kazigujexumakul.weebly.com/uploads/1/3/4/3/134320364/xoramowiveg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408355/normal_5fe51a0adba1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412905/normal_5fa19b306a07c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5fa734dc47110.pdfIn PDF document text
    • https://luwigemo.weebly.com/uploads/1/3/4/5/134597726/a0b9f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e528efe2-1732-48a0-b2e8-673ae2d4300c/cours_ses_premiere_es.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32671446-deee-43e5-91b8-25f5751e3e9f/8898935440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d8fc9d9-3715-49e8-9cb3-83da46ce7250/64996503594.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E6 4832 bytes
SHA-256: 93d9cf03d20eea021fe2e3ff21a8cfd906e453eb07c6c7c1f96161a91680774e
font_01_sfnt_off0000c665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC665 10236 bytes
SHA-256: 95751bf8a5a85ccb67918fc7b0f7c5d12a7f1f762e03be1da71d5df165d6cb78
font_02_sfnt_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 16120 bytes
SHA-256: 184efd0e138a9418359f6897f9ac56b5cd93cafbd57abf30711ac2aee7e18832
font_03_sfnt_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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