Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb565d21379c7e90…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 02:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 674cb22fb18b1064786b17cb83ef7b2d SHA-1: 6459a2cbd7ebb9df2c2eb0473ae8dff7b1982489 SHA-256: bb565d21379c7e90e07ccd59fa96db9bda298f9c52d8b151c613758c77aad5cc
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 structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=ac+market+apk+free+download+for+pc PDF link annotation
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/rigagemezugupepubulikomo.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/motojugadenumeladolos.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/kolopakozituturavu.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/11761694907.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/22555206427.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/10756570192.pdfIn PDF document text
    • https://insp.biz/img/file/sazopugepuwifevuboro.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/tifalotuj.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/nezisi.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/rapilabulisetekisolovuli.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/kafisutapigerebu.pdfIn PDF document text
    • https://aokman-drive.com/d/files/lalugatirakumuwinixaxe.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/kuxalu.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/gebamagesegowokikawebaso.pdfIn PDF document text
    • http://tayles.com/uploaded/68098802106.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/gusararolubewirowijuru.pdfIn PDF document text
    • https://posh.hr/files/genalo.pdfIn PDF document text
    • http://travellerisland.com/files/padodezenemogur.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/kafufezebed.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/jumetolujijofapub.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/tejagofigikasumumamepe.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/56610456197.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_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 10680 bytes
SHA-256: eb583b847abed53d6ce375aae099ac49a467cd827e904b9c4d2ecd5f38a928de
font_01_sfnt_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 18456 bytes
SHA-256: 4b97f15ec392df35275f2f6b12478ccd331dadccb86b28b20d1268237ed4671e
font_02_sfnt_off000121a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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