Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6b222b6e73561a…

MALICIOUS

PDF

76.0 KB Created: 2021-03-03 13:09:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 947dc157d1bd53e054cc2e5f204993ef SHA-1: fd09ec0ce57ad72adb0f63cb20fbaa1559b6be62 SHA-256: 7a6b222b6e73561a47694b43cc6f913cb94c4d27c470c0bf3da4b8c44d1b0613
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting or link farms, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/award?keyword=can-am+commander+service+manual+free+download PDF link annotation
    • https://cdn.sqhk.co/gukisafuw/fhbFgD3/desktop_tower_defense_hard_strategy.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/EsPhfif/gapexedorizawo.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/bgdI8hd/79621397338.pdfIn PDF document text
    • http://pobasomitiji.22web.org/sizagaradad.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/hbTwggb/download_epic_skater_mod_apk_terbaru.pdfIn PDF document text
    • http://javaxirivibewi.mygamesonline.org/why_otto_cycle_is_more_efficient_than_diesel_cycle.pdfIn PDF document text
    • http://kieverts.xyz/firefox_file_limitl0lqo.pdfIn PDF document text
    • https://cdn.sqhk.co/rumomezojeku/jeUNLhg/dog_games_for_nintendo_3ds.pdfIn PDF document text
    • http://vofufime.mypressonline.com/masterbuilt_pro_mes_130p_bluetooth_digital_electric_smoker.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/wupagivoz/direct_line_car_insurance_certificate.pdfIn PDF document text
    • http://metomegijat.epizy.com/blending_words_worksheets_for_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/gawiwesumiduduruvixemiten.pdfIn PDF document text
    • http://gepopimasirepav.rf.gd/94650595632.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/wall_street_journal_review_section.pdfIn PDF document text
    • http://kobizesamow.rf.gd/zedir.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/2018_audi_a5_cabriolet_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/wifabuv.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_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 5256 bytes
SHA-256: f677d10e5408f318065a942b4ce77794578d1490311175e585d04f8bb73a5b5a
font_01_sfnt_off0000ff5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 10460 bytes
SHA-256: 9fd529f9810299d43a0740cfb97eb22609ad4caaeed4fea8a9922eb7676b08f4

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