Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a54bd4213ab394…

MALICIOUS

PDF

75.5 KB Created: 2021-03-18 21:08:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 40f47e5cbff9dff07f4519b1861d34fe SHA-1: f272eeb5ed80d0eb2ff079957e64f31b95223715 SHA-256: a9a54bd4213ab3945f584c812b431056c92980e5245b6fcb9ccd96441d42adf1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs that lead to suspicious domains, including one that mimics a search result for 'tai chi moves for beginners pdf'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host multiple links on disposable domains, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/award?keyword=tai+chi+moves+for+beginners+pdf PDF link annotation
    • http://kifisafobubupo.mygamesonline.org/what_are_some_irish_instruments.pdfIn PDF document text
    • https://cdn.sqhk.co/rebawigabog/m7yIb4x/famelalinabudunoxirabudeg.pdfIn PDF document text
    • https://cdn.sqhk.co/neliwuwo/cggAspR/56154569093.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/similarities_between_impressionism_and_expressionism_art.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/22747160122.pdfIn PDF document text
    • http://narelarijejale.iblogger.org/52702662341.pdfIn PDF document text
    • http://rezokivi.medianewsonline.com/74666017488.pdfIn PDF document text
    • http://terugate.mypressonline.com/xamesigenejatelib.pdfIn PDF document text
    • http://xigepukel.22web.org/the_game_changers_documentary_amazon.pdfIn PDF document text
    • http://lisilagitani.22web.org/14491878114.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://redifigikutusoj.myartsonline.com/vindicated_confessions_of_a_video_vixen_ten_years_later.pdfIn PDF document text
    • http://roxonolabixatox.epizy.com/nedebuxunowibulasavi.pdfIn PDF document text
    • http://luredavum.epizy.com/pokmon_soul_silver_walkthrough_serebii.pdfIn PDF document text
    • http://wosunitiguzivef.epizy.com/autocad_mep_2017_tutorial.pdfIn PDF document text
    • https://2ea3657d-1c4c-40dd-8491-58aeeb8dc933.filesusr.com/ugd/18a85a_1365a3d682a143cb8d4e8dc68208dd38.pdf?index=trueIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_695610284b7847b6b246ea8609568f7b.pdf?index=trueIn PDF document text
    • http://wipibefab.onlinewebshop.net/zirizegevuviturefanawu.pdfIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/diy_pipe_bender_plans.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_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 5688 bytes
SHA-256: e0dee555018bb726dd506c8411a9ad6d4dd76f53d7348686da83a06cd7ba521d
font_01_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 10308 bytes
SHA-256: 7bd8de131c0c1e9c75ca2ab1bd8a763848c50237ff95c85b9753c9c0c3f93b4b

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