Malicious PDF — malware analysis report

Static analysis result for SHA-256 9093d91d31625668…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 09:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0fb6d8e3d9b7aea7da18f925c2b49794 SHA-1: c163bcaed22c6de86a88f740b63e1185275e63b8 SHA-256: 9093d91d316256686e4ddd359dcbcf8bcfc05cf8ddb8edbfdcf5d59ccfc87b86
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to suspicious domains, which are likely part of a link farm designed to redirect users. The presence of external URIs and the overall structure suggest an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://asthasupermarket.com/userfiles/file/nifive.pdf In PDF document text
    • http://lobi.md/userfiles/file/tosaxuluzelewuj.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/wugutidikupegagodenule.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/zegeviwatatatigunole.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/92887515848.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/wuvosulok.pdfIn PDF document text
    • http://cwesp.biz/upload/file/56839019128.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/43220556506.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/bupokalidizipi.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/86152525818.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/tabesafedebibaletenoli.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/aqs2o6j4jhid9qa9vfq7oaj9bc/nolofanipokasima.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/zatiresorofabo.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/22054639738.pdfIn PDF document text
    • https://premiersuli.hu/files/files/xutoxo.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/40522937252.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/48329631952.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/3421229166.pdfIn PDF document text
    • https://qkon.ca/images/file/dazukevozid.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/71191166529.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/442ef90315976122374f9daec58298c5/ravewakigifala.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/siwunewofolap.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/58579365479.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/99632723979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hairstyle+app+for+android+free+downloadPDF link annotation
    • 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_off0000da6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6F 10680 bytes
SHA-256: f55b8d7d758f0912e7d91a8e85a92dd94da35501e7e3046293abde732a4a173d
font_01_sfnt_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B29 18344 bytes
SHA-256: 470d8fa25b344f42a805a0fabbc9b131f0841e6c8b59752209128960d090d6a5

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