Malicious PDF — malware analysis report

Static analysis result for SHA-256 56af3c81109c2a96…

MALICIOUS

PDF

75.0 KB Created: 2020-12-28 06:22:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32f53aee5dc2d7f450a67356d216dd58 SHA-1: b5e6981638a6b43e187176cde29d6004deb6c30f SHA-256: 56af3c81109c2a96b4b5c842ee7a8cd5fb14d7cdfb98d763a84f3a229ae78ac4
96 Risk Score

Malware Insights

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

The PDF document contains an embedded URL that directs users to a suspicious domain, disguised with a seemingly innocuous topic. ML classifiers and ClamAV strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of an external URI is a primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/123?utm_term=how+to+blend+acrylic+paint+background
    • https://cdn-cms.f-static.net/uploads/4470681/normal_5faeee16e1335.pdf
    • https://cdn-cms.f-static.net/uploads/4370764/normal_5f8de5085d3a1.pdf
    • https://cdn-cms.f-static.net/uploads/4373239/normal_5f96b637c2fc6.pdf
    • https://cdn-cms.f-static.net/uploads/4401555/normal_5fbed99aa346b.pdf
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f8d3d2728837.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wizitifowubux/algebra_1_regents_test.pdf
    • https://s3.amazonaws.com/tuxutedi/colposcopy_guidelines_nice.pdf
    • https://s3.amazonaws.com/ritoma/pitawojokotulatepujumutux.pdf
    • https://s3.amazonaws.com/mozirolinitaje/votaruso.pdf
    • https://s3.amazonaws.com/kewakuko/heartburn_in_spanish.pdf
    • https://s3.amazonaws.com/wutezigojuxi/wozirowaguxeruvogazakoru.pdf
    • https://s3.amazonaws.com/xisakazelelinim/76317125863.pdf
    • https://s3.amazonaws.com/suzujewa/narozejep.pdf
    • https://s3.amazonaws.com/mogipegi/54003627034.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_off0000ea1c.bin
8f2ba2ac845ae87c0631ae203378c29f98d3e0d29fc2454273ca02144ac5315f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 5420 bytes
font_01_sfnt_off0000fcaf.bin
5b976f2addc283ba2e49f5fe6e50ecc7d817ba033cd8ee0d62537e187d8f4d6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 9956 bytes

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