Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1555a337200ebc…

MALICIOUS

PDF

78.0 KB Created: 2021-09-17 23:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1d9890380e70094003860689f0fad550 SHA-1: f6f8c20ac2751c6c6cbbbd42091a693bb2569cc1 SHA-256: 2f1555a337200ebcc0e199206e981370323e20cea823b8e8916639e67774945d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic of using numerous low-reputation links to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://oniceh.ru/uplcv?utm_term=tahoe+qr+scanner PDF link annotation
    • http://yas-center.ru/userfiles/file/suvefuge.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/kaweziwewalokap.pdfIn PDF document text
    • http://tfforming.ru/d/files/kapameruvugobojak.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/taladasiwukujuwurir.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/godakawomevo.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/24705910645.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/21582911572.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/nowemowafobedodepo.pdfIn PDF document text
    • http://kasargod.net/uploads/file/43887708404.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/7481060985.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/rixusadevi.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/23909889091.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/af2f350df1c5d1e38bc8d7bfb8936e4e/7538132163.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109131403218361.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/gudugenisetalaxufok.pdfIn PDF document text
    • http://pabxlg.com/userfiles/file/16582847047.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/nojimujefujonipumegazib.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/refaferunolo.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6354d5687---lubedu.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/23811744952.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/8397860288.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/56745162668.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/bulefalazobidasi.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/79904594387.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E2 20116 bytes
SHA-256: dbce5e361f2bf9cd7cbaccd3ea63d6b8b40a696eab8b22a960487abdcbd60194
font_01_sfnt_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 2960 bytes
SHA-256: dc1e80fb16c3a779e1bdcd0f599b6c946bd11803be07049a09e39e7c3f03c404
font_02_sfnt_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 10200 bytes
SHA-256: 197607d800093c340f35d1ea304d717a014a99d9adc2d27bc0b73c477dbb41ce
font_03_sfnt_off00010ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1