Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf46e92f705c8af0…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 19:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c72fdad185cba5cbadcde80cd75a4de SHA-1: 9cb71886c7da66702686cdcf11cc4d80af580257 SHA-256: bf46e92f705c8af04bae05b5492267ab5e835667c1c8c12a3ac478c93ea7b195
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which appear to be part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=download+stickman+spider+rope+hero+mod+apk PDF link annotation
    • http://tlumacz-bialystok.pl/pliki/file/rowolinedorapezebizutaden.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/rovizug.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/80661294886.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/52430502551.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/63330149923.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/45818585181.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109080658308835.pdfIn PDF document text
    • http://brukbet.com/user_images/file/85427094720.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/nedikaf.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/86751988040.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109080056069195.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/zoxasobogizakub.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/10342269444.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/sikaxokewunamarufoxide.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/mipolonixofevuzuzeg.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/fafejigaweradekedibilole.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/77809043087.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/laromugebezufupimedes.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/15544329053.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/bedenavilagupufinebopin.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/wogeginuribimazuravune.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/zebavujomawaruf.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/21218287129.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/zifozelilonimowopag.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_off0000d364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD364 10956 bytes
SHA-256: a687d88af147ffe7054f5ffb34eb0342e4f7997c8387d8569211c2ace77833a6
font_01_sfnt_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 17504 bytes
SHA-256: 95efa7a35ecc8f84f6b97be2313a8a3efab2dcbca1acc18142b79fbdd3f10d8b
font_02_sfnt_off000119ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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