Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac667f824277f14…

MALICIOUS

PDF

72.8 KB Created: 2021-02-25 16:21:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0406c5e174d84818ad02166479382566 SHA-1: c07b450c09f38f62fce28a234de809177afd57da SHA-256: aac667f824277f146563b23504913126267f2a8a8c94d52da18d3d2a6960589c
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious or unwanted software. The document body, though heavily obfuscated, contains keywords related to software 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://seumenha.ru/award?keyword=microsoft+project+2013+32+bit+free+download+full+version PDF link annotation
    • https://cdn.sqhk.co/jasurisunav/ijqjgjb/lightroom_presets_tutorial_pinterest.pdfIn PDF document text
    • http://qwert-ita.fun/within_the_ruins_merchnx64i.pdfIn PDF document text
    • https://tewazaxapij.weebly.com/uploads/1/3/4/8/134873756/2673391.pdfIn PDF document text
    • http://ig-socialmedia.xyz/bukuto9brmf.pdfIn PDF document text
    • http://lefuvaguvupawax.iblogger.org/establecimientos_de_alimentos_y_bebidas_en_mxico.pdfIn PDF document text
    • http://copytoshka.ru/big_boss_8.5-qt_oval_pressure_cookerz44h0.pdfIn PDF document text
    • http://polfact.site/fixed_asset_management_softwaredbga5.pdfIn PDF document text
    • http://nextauto02.ru/rhyming_words_worksheets_for_grade_2ywqwp.pdfIn PDF document text
    • http://iranianvc.com/lenovo_g50-80_hard_drive_sizeyhbim.pdfIn PDF document text
    • https://jojesiwanoj.weebly.com/uploads/1/3/3/9/133986560/podusebako-fedavogunurez-wiwodabilaf.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/igCucd4/infection_symptoms_and_signs.pdfIn PDF document text
    • https://tudegikugil.weebly.com/uploads/1/3/5/3/135317618/dokug.pdfIn PDF document text
    • https://cdn.sqhk.co/resesexiraf/ibCieIz/ghost_rider_cards.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/JcgjJYs/zombie_strike_fps_battle_assault_mode.pdfIn PDF document text
    • http://marketitaly.info/bhu_bsc_agriculture_syllabus94dpf.pdfIn PDF document text
    • http://lovechat24.club/81155221624ik2e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bozexobasunuz.rf.gd/check_my_starbucks_gift_card_balance.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 6012 bytes
SHA-256: b42153e98b645488ddc4dc515f13a1b06ef98aeb8964f580794e1f27f29bc2d4
font_01_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 10536 bytes
SHA-256: 4d25b2b6017f378d70dfcab6dd8f103248882bd8447badba339a35945b6f49c8

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