Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6c659bfddcce38…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 11:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 133e6f8b56e154dc9a03a72b4ffb784d SHA-1: 318bfada968099c464675aae98d684ea39614212 SHA-256: 9c6c659bfddcce389c319a20155c701423a285980123097220be28bf7452ca10
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the embedded JavaScript likely redirects to a collection of links hosted on disposable domains, a typical pattern for phishing or malware distribution. The ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://tearose-kitchen.com/sites/default/files/images/imcefile/xusebufuwopurakorijudol.pdf In PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/4017673654.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/semusizaga.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/31077917555.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/83515040185.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/47121802231.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/lanajiz.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/81166401794.pdfIn PDF document text
    • http://househouse.it/userfiles/files/ripusazet.pdfIn PDF document text
    • https://durimawar.com/contents/files/1188024143.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/besuga.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/pemufarenirefif.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/15661408626.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/zewipet.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bdcbb59d4---muvanenolasolutixu.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/depojuvesilepawig.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/wevozirepanawulofadunasu.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/xikudaw.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/62797660216.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145d18498560---kusevugimababel.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/sefivan.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/gadanigadisov.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/lelegazefevivogojupawuzot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=train+simulator+pro+2018+download+freePDF 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://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_off0000b181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB181 15116 bytes
SHA-256: c6cb87f33499482cd9a2bcf73c69afd0bf2af9f3373c45c4ea7fab57eb750b6b
font_01_sfnt_off0000d774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD774 11312 bytes
SHA-256: ac1107605ff02ed0604833580ecaca334d80f2ee6607fe57863d49f9370bb076
font_02_sfnt_off0000f228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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