Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac5fa5d21c19d24…

MALICIOUS

PDF

75.5 KB Created: 2021-01-28 16:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03c7402c54625fca2d1c5b5874f1dfda SHA-1: c4a4c929f6c03f578bf4291c553d4c1bbe0dd9d0 SHA-256: 7ac5fa5d21c19d242dfff788a507377309548963c6b4e2b692efc6ac681bb16b
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The embedded URL, 'https://seumenha.ru/wb?keyword=tennessee%20titans%20covid%2019%20cases', suggests a phishing or social engineering lure, likely attempting to trick the user into visiting a compromised site. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest it's a downloader or phishing document.

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://seumenha.ru/wb?keyword=tennessee%20titans%20covid%2019%20cases PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486033/normal_60119c58d1d8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407998/normal_5fdd74d52e638.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/ZQyghij/37771368614.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501383/normal_5ffc187b4697e.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/u9gfy1d/cars_movie_toys_collection.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465557/normal_5fc7ad96129fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444110/normal_5fc8004444603.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/wxnjfIi/silicon_valley_season_6_episode_7_air_time.pdfIn PDF document text
    • http://fdvsefwfrw.space/2_player_pastimes_mod_apkkln2l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389106/normal_5fef6605ebb9b.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/WQcKvgY/cannot_remove_fill_color_word.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392861/normal_5fed9872a66bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417213/normal_5fd1e01ad4fec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/cambridge_11_reading_test_3_answer_key.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_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 5020 bytes
SHA-256: aa3328d59984472e0c906b2184b7baf3c8509d7e2543bf83eb98bfb024b9742c
font_01_sfnt_off0000fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 10136 bytes
SHA-256: 53ff3bbd1fee07d15afb95799487ec8173bc720582e116c12ff55405a7830bd5

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