Malicious PDF — malware analysis report

Static analysis result for SHA-256 8484fd7308396c26…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 21:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef85e42a33a2dc3aede53ab3a3af4745 SHA-1: 546b2ea6f031f4d0b7ce34381b72015690d4f84d SHA-256: 8484fd7308396c260f788fed916182b1b7067458db63360f42d19db12b42fe66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and heuristics point towards a malicious PDF designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84101508133.pdf In PDF document text
    • http://wsmr.us/userfiles/file/dumelel.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/ludavulowugaterezolegoz.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/vezezoxoperipawelajil.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/gebateluzi.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/29447244762.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/nusikadojejofa.pdfIn PDF document text
    • http://mlight.cz/archiv/file/kuxidubedoxi.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0eaadd8f5969ee59c1b85d61f2144e31/faditijutuwi.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/70979778203.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zodapeta.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/25925812066.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/90244072620.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/lokaxisezireximo.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/59231946586.pdfIn PDF document text
    • http://kes.org/upload/editor/files/73121427413.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139159d21336---fazawumojadoba.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/niluwajod.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/lisixad.pdfIn PDF document text
    • http://groupkaishan.com/d/files/jumakaxajoxedenegobabed.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/mavubinazelibijotitumed.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/61319508215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=unlimited+cod+pointsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000b7b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB7B2 17632 bytes
SHA-256: 28921fa25c0ccd6266af3a288c07cd3cda4ff7580b15adee30e31d827f20c370
font_01_sfnt_off0000d238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD238 16320 bytes
SHA-256: 4c0080fa10433005eba58a12ce5aaf5e1ed7407fa59d68ee6fe18d82fa08c3f9
font_02_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000113df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DF 10420 bytes
SHA-256: b09fa7e566f95d093dbdd6a0cd37a1130af77e2573ddbac5763b6ee610730e3f

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