Malicious PDF — malware analysis report

Static analysis result for SHA-256 8179ebb0f167ed42…

MALICIOUS

PDF

71.2 KB Created: 2021-10-01 04:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b43c7e7f9ce393b99116227916ff6456 SHA-1: 5259aafff108eb90b3cb24364a93413e2f5b0124 SHA-256: 8179ebb0f167ed421a26182d144ee161701a0c9082632cbddbc6b81278e41bfd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=when+will+the+next+my+hero+academia+episode+come+out PDF link annotation
    • http://wirheiraten.de/images/file/wodularovakarerixetuwi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/7b095b2ca4acf38d1b1a8ae9714f6d7f/bovexuzo.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/1820471292.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/65835082587.pdfIn PDF document text
    • https://fishboat.hr/files/subepuxijujabekomuzul.pdfIn PDF document text
    • http://tai-group.com/upload/files/burilozupupubupanofor.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/poxab.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/10752057115.pdfIn PDF document text
    • https://jss-moms.si/upload/File/lovazemogixodiribuzov.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/serevuwawituritulurixatul.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/89718650041.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/wiverexutobipir.pdfIn PDF document text
    • http://sswjeans.com/files/58288992937.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/vorokabepofuga.pdfIn PDF document text
    • http://guitarenko.fr/img/files/zabuwenukapabiwovuso.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/liteved.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/zigevopezevabosibuv.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/zasebuf.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/zelofabugoxites.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/negozip.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/felaxozuzunax.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/97605193131.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/wadapowisogavekobasejigo.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_off0000b20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20C 16812 bytes
SHA-256: 69db22f38f1aeb830856eb264e290d8255d974892fd9e95bde1d168be371d2c3
font_01_sfnt_off0000dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 11172 bytes
SHA-256: 84a86b290187eb6d0431d958f2535e2402849d66be31435cc494128038b1edce
font_02_sfnt_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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