Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6945c2112eee771…

MALICIOUS

PDF

75.6 KB Created: 2021-09-20 14:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc3288cbe9bde295e7ccb921d5a152a4 SHA-1: 33a956db1811e38051dca8e1bd33f27715f6a489 SHA-256: c6945c2112eee7717fef3fcc469b3b98a49b0c98c5ac81c25d371cfe66ce8101
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript indicates a potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210902101136.pdf In PDF document text
    • http://sdhmladavozice.cz/userfiles/file/32915494395.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/92448544467.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/wisodujusiledeti.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/85761432571.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/xipik.pdfIn PDF document text
    • http://artospace.com/pics/file/bewikirupurepawutej.pdfIn PDF document text
    • http://asja.ua/userfiles/file/wojamewawokar.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/36862640092.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/7894422481.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/liduboripoxa.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210915184523.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/917241049.pdfIn PDF document text
    • http://recrute.fr/files/files/46855803796.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/noxoxunamosubot.pdfIn PDF document text
    • https://yuktogel.com/contents/files/ginilifizo.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/81991435109.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/sozubupukakejerulazo.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/wixunogevukexuniv.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/bekukexitamu.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/tenesamu.pdfIn PDF document text
    • http://edituj.cz/res/file/vemabomaben.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/tufepuxe.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/31236812212.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/2309351409.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/1721070330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cast+video+to+tv+but+listen+to+audio+from+phonePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DD 16860 bytes
SHA-256: 0687040f19fca35083930b19cfff68e4c675142b6a27fab57ae7a4b99b9b6fe4
font_01_sfnt_off0000ee75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001068c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 11100 bytes
SHA-256: 75422c8642184c617dbf8cc835930d773bffd157c32a4a8b7868eeda7bfe38ed