Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf179099bf8e33d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 19:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d42d27f8c77ca95e1f8e23cc301a956 SHA-1: 088f4a9146a8dde7ea8f798df67adb95861ac4c6 SHA-256: ccf179099bf8e33dd11806138594928bbdb58d554a3fea1f7465ab635f1611bd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic. It contains numerous embedded URLs pointing to other PDF files, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or the delivery of a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nova-auto.com/upload/10712679605.pdf In PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/64434334639.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/vigilidewuvosepupa.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/79433569247.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d23f52e3e5---goverixog.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/jopigulofemi.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/32171916238.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/zonulusesazosonanobew.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/28760329828.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_16_00_21_21_9833.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/fedepepajefadiruvifotu.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/rifirofame.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/32518252102.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/zanetumod.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/20492626345.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/lavonidejajapa.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/mojizeb.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/89358451702.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/sujijugutexuzolef.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a8513e024adfcca16f206c0ca2a78ae7/dagajuweb.pdfIn PDF document text
    • http://cartopack.be/Images/file/46347005198.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/barifodazojuw.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/87644133153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=6lack+instrumental+mp3+downloadPDF 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_off0000d7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B5 11196 bytes
SHA-256: edb600a7118ea8f9caff0242bbbb8f1f97d5b90c3518231f944bf56aeb93b54c
font_01_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 18308 bytes
SHA-256: 3749f974940d9a88328a3065a99387139901b618e769ac552ac67ea5b1dcf1e0
font_02_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1