Malicious PDF — malware analysis report

Static analysis result for SHA-256 89cf8ffc9ac3590f…

MALICIOUS

PDF

78.8 KB Created: 2021-09-09 17:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b711443532d802c2ae9772bd0792e53 SHA-1: a1a6bb0e05c2c7ad45b88a1d3aa7b6d138a28b84 SHA-256: 89cf8ffc9ac3590ff9279d8785c2464369a92875819c3665db646ac06b857c81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with many pointing to potentially malicious domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to lure users to external resources, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://elmbbq.com/uploads/files/dixuzakusu.pdf In PDF document text
    • http://feg.vn/uploads/files/24242711692.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138a575f29d5---92424227229.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/49722844965.pdfIn PDF document text
    • https://sanidom.pl/img/file/ronitumesepepadusudukebuf.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/76334012051.pdfIn PDF document text
    • http://fkhd.cz/data/img/50328517741.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/53652377860.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rokiluvo.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/sujugegajamovekomalajotip.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/13090772003.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/22951591980.pdfIn PDF document text
    • http://fygl.net/uploads/file/041433204205.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/5763826019.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/3196181154.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/47531709556.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/keruda.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/87713737974.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/mowukolarojapifivawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cit+league+of+stickmanPDF 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_off0000cec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 17748 bytes
SHA-256: dc59bb957805ab4701b22488feb3396919d23f3ad2aae24f70706e94dc5c0624
font_02_sfnt_off00011562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11562 10800 bytes
SHA-256: 810d5504812e31da34c7168e1faa56ee7768cdd2b7faffa8aa7a58e12b98835e

Open this report in the interactive analyzer, or submit your own file for analysis.