Malicious PDF — malware analysis report

Static analysis result for SHA-256 771abc28b25e4614…

MALICIOUS

PDF

85.6 KB Created: 2021-09-22 21:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ba0f02f1f9797273d6d53e0f6d1b23c SHA-1: 7ac786007dcef17cc7ea7b76a7601af80025c674 SHA-256: 771abc28b25e4614c9cd8c74d2be86b05091d37bd2d33fe58198cbe48af856be
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of a QR code lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://shardamedicalstore.com/singhania/downloads/file/gudafobose.pdf In PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/gonuber.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/mozetewuvaraxob.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16136f67c59d0c---17893674005.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/20170289029.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/35784702651.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/ebfb2f13d3ddd378852a63b6c84fb18d/76694915794.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/pemosivosezujirewimasewel.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/mobovelipeso.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/zabodafazusame.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210921032349.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/74576872481.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/20707383335.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/99673083619.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/74991166397.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210922155530.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210908200126.pdfIn PDF document text
    • http://samtekelektrik.com/files/goxavajawobozexupebozebur.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/nelojenesod.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/80320217331.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/fovujasupowopumutidoko.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/buzugovabu.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/45705769340.pdfIn PDF document text
    • https://stauber.lt/images/files/kodiwalepetuxemokuwateto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=start+programming+for+androidPDF 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_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 10572 bytes
SHA-256: a7c60ec980474f7110e9cd0f218b2e8fa2735b08e045934d40105164e494c665
font_02_sfnt_off00011bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 17448 bytes
SHA-256: 99b99dca7582c12e01454a16697797864ea23cb273121a4549954d5b7741eeae