Malicious PDF — malware analysis report

Static analysis result for SHA-256 87664e3048afeb27…

MALICIOUS

PDF

75.3 KB Created: 2020-12-03 11:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2f5bfa2adcd10785e0c5e22343e443b1 SHA-1: 39bd5602e9b5fd26e43461b6b2fd0ff7fae529aa SHA-256: 87664e3048afeb27eebbcd9efd1d0a6ec7aa47d987edd3ee0a9113eb5ecc990d
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a critical heuristic firing for ClamAV detection. An external URI pointing to 'traffine.ru' was extracted, suggesting a phishing or malware distribution attempt. The document body, though heavily garbled, contains text related to 'Valley forge military academy uniforms' and the wkhtmltopdf application, which could be part of a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/aws?utm_term=valley+forge+military+academy+uniforms PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413475/normal_5fa4fba16b1e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470975/normal_5fa6fe0a575d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f87059074348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_5f9a90bed2ccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489041/normal_5faac408522b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382780/normal_5f8e031575304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_5fae609a106e2.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://s3.amazonaws.com/kavitokolezub/18134953430.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/beretta_nano_guide_rod.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/10496068411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a2c0453-e592-4e32-a981-3c636ef97a6d/lesoto.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/alp_answer_key_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/64475489372.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC747 6744 bytes
SHA-256: ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425
font_01_sfnt_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 5288 bytes
SHA-256: 7bb9ac1f349c19f96c83a5eccf903d5059c90719ae9b823c5ed771e95e2a211a
font_02_sfnt_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 12416 bytes
SHA-256: 3ceb143737432799a355e95607ef604d970519a24b67599918d71f424436ec8a
font_03_sfnt_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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