Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8161bcf6ca0315…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 09:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8b9c505db3ae37b8a0bc46d57f8d7ac SHA-1: dad37eae1b22c619d12d9774f3ed9b63088e78e1 SHA-256: cc8161bcf6ca03158b0d4577e347c32f43bf0f656d24d9f39e5f6cf1bee207b7
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it employs social engineering tactics, luring the user to install a browser extension or update, and also mentions password-protected archives, suggesting a multi-stage infection or credential theft attempt. The document contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, likely serving as part of a link farm or hosting further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a497e05fe58dd8164204932adf9001bb/1932456092.pdf In PDF document text
    • http://massarentearchitettura.com/userfiles/files/vewogu.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/turowijelik.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/qdltajl8g8u3jsor9q6aej4vb5/46366720364.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/70760078037.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sotukefasalovumigu.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/godasizomid.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/21798507414.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/dogeredudoxuko.pdfIn PDF document text
    • http://simoncaulkin.com/images/77081231716.pdfIn PDF document text
    • http://julianina.dk/upload/file/40179192696.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/fezuwegaboza.pdfIn PDF document text
    • https://datajournonepal.org/files/34658537079.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/83619062694.pdfIn PDF document text
    • https://grancom.by/upload/docs/zoxerinonitonaraxexumab.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/dofupisobuvilewefadaxaxi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb8d5c9d0---65638875711.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/kabikoxubobojoxazikekuj.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/83029291778.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/90988972987.pdfIn PDF document text
    • https://camphacement.vn/upload/files/wasunifuzikurawikobal.pdfIn PDF document text
    • http://bptramptour.pl/files/file/wimiwodaxowumemim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+blacklist+websites+on+chromePDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/dakotidakipinovirin.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_off0000df05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 10804 bytes
SHA-256: d617f0bc7ddb8399db6d90d551a91a33c3b122502580dc043a616179a2976730
font_01_sfnt_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD6 18296 bytes
SHA-256: 62ddf19e60f14f6b786c7ff5f557dd396d61bfac9ed093c9ba70236ccffac44d