Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac52d8926523e055…

MALICIOUS

PDF

102.9 KB Created: 2021-09-11 06:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6a992b63fe88897a5049226b3ab7f3f6 SHA-1: ad4597337314aab627679c01592f7df19e6ce1d8 SHA-256: ac52d8926523e05549b71dd01f14ece4ed30c8633f54895dfa7edf246949904a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript to facilitate these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9847

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 https://sluganarodu.org/userfiles/files/45786147198.pdf In PDF document text
    • http://mail-business.ru/uploads/file/paxasekekazuxofisutidupo.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1630508177463.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/42855248168.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/kupowogizu.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/68551574602.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/puvelete.pdfIn PDF document text
    • http://rentaruedas.com/files/others/94195125360.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/g5g4kteoo70nqktoehn2jr0cb4/73311024498.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/nonapi.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/suwamagotaselenoze.pdfIn PDF document text
    • https://esz.jp/img/editor/files/nigujizuwugopiju.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/kugigokeziboluto.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/dikabelabetekata.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/pekamafonetawatamazade.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebe7a3554e---zujewupexudexufujefuv.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/tifodukox.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/22350318975.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/fiwexolevidozibe.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/37932093453.pdfIn PDF document text
    • https://amgaa.org/temp/files/19337841272.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/9995552452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hack+clash+of+deityPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 24144 bytes
SHA-256: 386e5d7eee121c049dfadf2832a2987c5fd6d6c2fa1222796d7dec5a018d2f04
font_01_sfnt_off00013e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E25 10568 bytes
SHA-256: 3bcf698abee6fa51dd3f1f85f6e42aec483cc85d20621c6db1664b7b809990eb
font_02_sfnt_off00015669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E76 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
font_04_sfnt_off0001773a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1773A 16192 bytes
SHA-256: 126aabc53b187bc4421529373f04e2f66a11804dfeaeb35cb650b132d56c1dbd