Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a306a286723eff2…

MALICIOUS

PDF

72.8 KB Created: 2021-09-17 23:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 971943d6a1c4d447eb9b4e967f1b9f66 SHA-1: 9be739960efd22afcbdcd08dc9a136d5a618e2b0 SHA-256: 3a306a286723eff2ad7c84533b676d77a169de8884bd8930dad0a1b60a5719b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The presence of external URIs and the classification as a link farm strongly suggest a phishing or malware distribution campaign. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=clash+royale+hack+ios PDF link annotation
    • http://azizavacanze.com/userfiles/files/kisopunowon.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/koxiwobubup.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e8d8897fccd104cc89c80e3b3a6b2fab/51898223494.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/vunufamesazajukosiditoga.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/zonasafasaxejeruzivogunor.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/jaduturugiwinaliwajapaz.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/gilitibonazez.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/49901951603.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210907213209.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/nulezegawusexaguj.pdfIn PDF document text
    • https://redac.ch/upload/37997882159.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/gifijaf.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd4b6eb408---82884540306.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/wovegovakika.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/dabogavugukijixiruzonoti.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/vowijijotesozotirej.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/14323748235.pdfIn PDF document text
    • https://kildevangen.dk/files/wezadevoxabetibonodut.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/56998790569.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/pukifumidusezajaboju.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/rekewesup.pdfIn PDF document text
    • http://grimastone.ru/files/84901121356.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090808034334.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000babd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABD 16940 bytes
SHA-256: 1fc17318c16e927f259dab929b99ff7dea4d0d7cda5f9c4543d895db3afcc9f1
font_01_sfnt_off0000e6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 10364 bytes
SHA-256: 2704edf791f9882f7948c57ce35ed0725956033fc129a7b28f0ccf27b52a744f

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