Malicious PDF — malware analysis report

Static analysis result for SHA-256 f591da6857caf72f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 13:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 041ef218721e63364b3a9f2fdd0a4e9f SHA-1: 4e4196afc16a6056e234deb8e7047bdb3dbb9873 SHA-256: f591da6857caf72ff6e35f63c5f17bc0be263cd4d1fa3c9077dc3aa48a810c1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=smule+magic+piano+apk+download PDF link annotation
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133054eca7d0---tasazapoberorovupelotapa.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/gatorejemovomazawoz.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/99090763073.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b0f15fbc44cbfc236e068731c50a3e82/41712898234.pdfIn PDF document text
    • https://777mto.info/contents/files/21616305544.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/90687139327.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/waterimufakaf.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/siniwodivumegibededaw.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/ralugizosuwatebaj.pdfIn PDF document text
    • http://zzquansu.cn/d/files/logelivunomuluxawewom.pdfIn PDF document text
    • http://greenld.com/userfiles/jowuxug.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/nonuremolaluzonawi.pdfIn PDF document text
    • http://baove24h.info/upload/files/rovixapopas.pdfIn PDF document text
    • http://erpos.sk/data/files/ruxenuneruso.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/mibezikuk.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/bapagisas.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/bipemevupurokuxago.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/fabezumuxifudidamujowun.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/wupanogejexigutinipisew.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/c3532ec47f6fc79ae1d540bdc5010dc1/53082383076.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091003214797817.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/viliwosazuk.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/kiworavevipawu.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_off0000d662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD662 17476 bytes
SHA-256: d3b0056c48886baf87f9b17b84b6476b39ab54bcc40cf2502200161c50f80154
font_01_sfnt_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 10844 bytes
SHA-256: 86fde3f737b7fc715606862eea6fa96eefd201b49482f9bb374e4c90dda51421
font_02_sfnt_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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