Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fe6ea30705b2cc…

MALICIOUS

PDF

75.4 KB Created: 2021-03-23 12:03:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a353dda0ae2758f9be7a32194b35dead SHA-1: 78104d9bd3619afa2f159e4fac0c9f23f9f848c2 SHA-256: 24fe6ea30705b2cc484ab78e84165a238c4b8bff37cad3a3789835ccbe238fce
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of an AcroForm button with an action trigger suggests an attempt to initiate user interaction, likely leading to one of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://botokaw.ru/wix?keyword=burrows+wheeler+transform+inverse
    • https://cdn.sqhk.co/kovezozeseg/lJjarhg/27505155657.pdf
    • https://cdn.sqhk.co/xugosovemi/hduhegf/wozuweduxoxemavovadedopu.pdf
    • https://cdn.sqhk.co/manuguwe/jjgjfY1/ludo_online_dice_king_mod_apk.pdf
    • http://kesuvajeb.scienceontheweb.net/sampurn_aarti_sangrah_marathi.pdf
    • http://kukogekaw.sportsontheweb.net/nikki_blackketter_workout.pdf
    • http://tufofol.medianewsonline.com/caelum_java_apostila.pdf
    • http://kigumelez.medianewsonline.com/bavibopo.pdf
    • http://sopidemeleket.mygamesonline.org/89690536103.pdf
    • http://rugegav.mywebcommunity.org/example_of_application_letter_for_teacher.pdf
    • http://sujatafuluwariv.22web.org/aviation_risk_and_safety_management.pdf
    • http://siwupojotuj.getenjoyment.net/rules_of_the_game_summary_sparknotes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pewizofiwerobep.rf.gd/tazenepuridusepaxusuba.pdf
    • http://xafibejijopo.atwebpages.com/sakamoraguliwunumimogi.pdf
    • http://bavatesivo.myartsonline.com/sesifosamulati.pdf
    • https://uploads.strikinglycdn.com/files/dd84c6cb-b2d1-4b63-a725-0e527d08101e/2006_gmc_envoy_power_steering_pump_replacement.pdf
    • https://uploads.strikinglycdn.com/files/1d0b18aa-485b-40cf-8418-749a87e064c5/what_genre_is_miss_peregrines.pdf
    • https://uploads.strikinglycdn.com/files/78b80165-d1cf-4ced-a69d-52490e8e4d50/sanupobopijojenibenezu.pdf
    • http://joretewad.epizy.com/biologycorner._com_plant_cell_coloring_answers.pdf
    • http://wekujugom.epizy.com/67309435491.pdf
    • http://vawerudarasikow.myartsonline.com/counseling_psychology_definition.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b7.bin
58b0843264960d4f462267b034dcc6cdff56c5982a264145991b359ca9e5a7a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 5208 bytes
font_01_sfnt_off0000fa5b.bin
e35fcf79fd232a3a72cfb1fedee64f823058e2e42252a53c7c55b8bdd3811d2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 11132 bytes

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