Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a45b162b3ac7750…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 06:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 74beef59e4236dbb7d4f416265c6ce33 SHA-1: 97cf64f2008c44eae32f29320f249068d9d0b17e SHA-256: 1a45b162b3ac775064b0e839b0be19e352b1e4e1fc7a9a7f69ad113574ff82b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=joey+series+watch+online PDF link annotation
    • https://heureka-cz.eu/files/58863464493.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/xubumoduvun.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/47343696784.pdfIn PDF document text
    • http://compsult.net/userfiles/file/memanupewomoxaxoxew.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/lixodonasenamipimoturojo.pdfIn PDF document text
    • http://vpsystem.com/files/fck/masefapurififuwina.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/goxafibuwitod.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/47419277236.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/418dc8da555534af23fc3ace0ce2a25a/xotadojepe.pdfIn PDF document text
    • http://newo.ru/files/files/86760618394.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///37941752203.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/sefamegofidukogizovarozas.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/keveturobuwuxevadoboki.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/15254777252.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4b65ad9a6---5846835600.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/refan.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/gamowosomusiziwusiwa.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613b087a186d7.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/43941317159.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/52904864314.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/81616526723.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/32754891328.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1632168615_1.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/96936201931.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/jizonijiwulavakopat.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_off0000afde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDE 15208 bytes
SHA-256: 68844eedc295b468435758495ee6f632a6c8f3671e5dec76399e6260395ea3a2
font_01_sfnt_off0000d633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 10520 bytes
SHA-256: 040959a2ba41a4fc57addf96c526659cd829fb97add7a3b0be6a48eea797e782