Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9adb3144f1a7fa…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 14:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 228680ac58daa0f4ca5552a9b5f3f33c SHA-1: e1339be25d0d97d1f87632baca6d95b9740ee04f SHA-256: 8e9adb3144f1a7fa32faee5f0eb7badd1f0f3b4d7b9010a9757857ac77461635
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://amblesidewindermere.ca/fckuploads/images/file/bubode.pdf
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/14612103476.pdf
    • http://madurastones.com/userfiles/file/setigabu.pdf
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/55113716148.pdf
    • https://martas.vodrsport.cz/uploads/files/26738574592.pdf
    • http://qianxish.com/ckfind_image/files/jibokewu.pdf
    • http://www.yevres.fr/ckfinder/userfiles/files/23839578575.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/382fe0ff4879158ab8728ff24193cd1e/mujakitorifimid.pdf
    • http://edeins.com/userfiles/file/ravinuvevukixisowafaruf.pdf
    • http://moscowfashion.net/content/xuploadimages/file/83774729856.pdf
    • http://czerwoneiczarne.pl/files/file/23288435129.pdf
    • http://baharev76.ru/userfiles/file/mukimoxokupapewifoneja.pdf
    • http://boek.se/bilder_umeny/File/vefemivajoxo.pdf
    • http://15449010.com/FileData/ckfinder/files/20210902_9E254AEB22EB091A.pdf
    • http://kavernoklub.com/campannas/file/fafufonodepukojipomof.pdf
    • http://cambresisemploi.fr/ckfinder/userfiles/files/suziriduzetov.pdf
    • https://comptables-publics.fr/userfiles/file/jumuxemodesefudaperig.pdf
    • http://pampa.be/uploads/userfiles/files/59723485868.pdf
    • https://tatsolarlight.com/uploads/files/bofugadiforu.pdf
    • http://jump360.co/upload/files/20210925131329.pdf
    • http://singer-island-condos.com/userfiles/files/68423574270.pdf
    • http://golfvillageonline.com/userfiles/file/zuwedazeribimejaxas.pdf
    • https://imahima.xyz/js/ckfinder/userfiles/files/85475421811.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+among+us+apk+pc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af95.bin
9b1f6d67fd87faab74d3c56dd1d93b9429f6eb4735cd334ee9fff746af8278f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF95 17376 bytes
font_01_sfnt_off0000dbb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 16792 bytes
font_02_sfnt_off0000f3d0.bin
335188d5927387c1654f262fd77fe4c2d80f9d8a619043ac662019fb3cf92e94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 10716 bytes

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