Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43d5ae1aa61d017…

MALICIOUS

PDF

67.8 KB Created: 2021-02-24 07:47:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 46baf984b77144dd71d078662612c742 SHA-1: c69704c67205d3ef7164daf0361460ced507b337 SHA-256: f43d5ae1aa61d01711cff147432dc715f799fc09ffe54475d9c068fba7128299
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a link farm on disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of a 'download button' heuristic further supports a lure-based attack pattern, likely aiming to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/wix?keyword=introduction+to+chemical+engineering+thermodynamics+pdf+download PDF link annotation
    • http://madokedaxemosu.22web.org/ribunijelarotevetifibog.pdfIn PDF document text
    • http://burasiwe.22web.org/68627267518.pdfIn PDF document text
    • http://nubilejoso.iblogger.org/2326950576.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/hdBAvig/27195598456.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/gihchhO/change_hangout_skin.pdfIn PDF document text
    • http://poriwesebu.22web.org/fit_for_life_meal_plan_crystal_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/ib7hjgc/ropatuxuxuxurewubenonuv.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/dwhiRhh/radiant_heater_for_garage_use.pdfIn PDF document text
    • https://cdn.sqhk.co/rezeribevi/dhj7jhT/heroes_and_merchants_rpg_max.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuzabog.epizy.com/gelozuvinufotezapelevofa.pdfIn PDF document text
    • http://tojopoxirer.rf.gd/rozizerepetedox.pdfIn PDF document text
    • http://kafopazam.epizy.com/86225291182.pdfIn PDF document text
    • http://zujewutaze.epizy.com/easy_calm_piano_sheet_music.pdfIn PDF document text
    • http://vapedefomagejev.epizy.com/82610335862.pdfIn PDF document text
    • http://mebijido.rf.gd/how_many_bookcases_can_you_put_around_an_enchanting_table.pdfIn PDF document text
    • http://mejojaka.epizy.com/rajakaali_amman_songs_masstamilan.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_off0000c761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC761 5700 bytes
SHA-256: 456490388ab248954603c6944f1e9d799d2c2e84ccfab636066f2f2d9241aabb
font_01_sfnt_off0000dab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB2 11952 bytes
SHA-256: 88dbf62dd5ab0de8c444322caf6aece77bde37110ba3ceba4ee280537b02e3f7

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