Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f6cce3808ee059…

MALICIOUS

PDF

86.0 KB Created: 2021-03-27 18:02:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56de0b0e7043103b2fbf0a12f53c654c SHA-1: d7077c37ad57ab1d535787b0fdea4b5f8c7baffb SHA-256: 42f6cce3808ee0590f5bead9b25254ade6a585449665dd808a43c961c0c39321
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 for 'Pdf.Phishing.Trojan'. The embedded URLs and the PDF structure indicate it functions as a link farm, directing users to potentially malicious or phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/wix?keyword=biology+vocabulary+exercises
    • https://deparabijafepoj.weebly.com/uploads/1/3/4/0/134040416/fdb3afde42d4.pdf
    • http://nidomamedop.22web.org/scan_virus_android_online_gratis.pdf
    • https://gojenegitoz.weebly.com/uploads/1/3/4/3/134387591/eaa07fb0c.pdf
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/xupajob-jidoxebulobize-jimej.pdf
    • http://xidemapewa.22web.org/canevas_de_rdaction_d_un_projet_agricole.pdf
    • http://zexaribamemavi.sportsontheweb.net/nipabinuzonaziwipifo.pdf
    • https://cdn-cms.f-static.net/uploads/4485016/normal_60501cc32e569.pdf
    • https://befomunuduti.weebly.com/uploads/1/3/1/1/131164266/4983e867.pdf
    • https://static.s123-cdn-static.com/uploads/4470412/normal_5feb2e02818a0.pdf
    • https://cdn-cms.f-static.net/uploads/4452386/normal_5fda585685673.pdf
    • http://kirakexig.mypressonline.com/41669700618.pdf
    • http://bujunigalafe.iblogger.org/antologia_de_cuentos_latinoamericanos_alfaguara.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/4eb19a8a-d3ab-4540-a761-94fae4dd6a59/26681460383.pdf
    • http://mokijogibosa.epizy.com/dekumumovuguf.pdf
    • https://uploads.strikinglycdn.com/files/af0c1b40-8b53-4921-9c2c-7aa20476cb94/free_run_parkour_gym_los_angeles.pdf
    • https://uploads.strikinglycdn.com/files/70fe6d93-a382-4b3a-8027-d9e2e05a2193/timejafavaruvedimaxuno.pdf
    • http://nalokematu.rf.gd/asurion_affidavit_sprint_2017.pdf
    • https://uploads.strikinglycdn.com/files/975706ce-18b4-414b-b511-b9210a5cd455/biwiwazefilizot.pdf
    • http://rawuvotatu.rf.gd/ben_10_ultimate_alien_game_apkpure.pdf
    • http://jopiwutipav.epizy.com/vidmate_app_install_pc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105e9.bin
2bc2d253ac26429a77b9c90cb6682d63605b62a9bebf80a285441092bed51bc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 5080 bytes
font_01_sfnt_off00011745.bin
f772c009b941670744efe6304e94133018eababcb03e72ee91cda135a2ad66e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 11108 bytes
font_02_sfnt_off00013cd8.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD8 4324 bytes

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