Malicious PDF — malware analysis report

Static analysis result for SHA-256 abde1b21092761b7…

MALICIOUS

PDF

86.9 KB Created: 2021-09-24 08:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9dad6444788c1486b6f285e45335803f SHA-1: 0bfb901126bc98f1c7dcdbdedba7e634e4389d53 SHA-256: abde1b21092761b739b73c0ed3d9b0473a2c9e016cdeafe28bc9bd99fffa64a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, and one heuristic identified it as a link farm. While no scripts were extracted, the presence of multiple suspicious URLs suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ashioke.com/images/library/File/79085066916.pdf In PDF document text
    • http://nuovojob.com/userfiles/files/subarikevebenev.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/miloromuw.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/zadubip.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/47653942006.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/sirimagojuzebinugobesuvob.pdfIn PDF document text
    • https://marlin-shop.ru/ckfinder/userfiles/files/55166143352.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/rujoralifera.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/ditufa.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/1000950239.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210909200812.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/76492105508.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a4f3b3a4371e05889f715c138316c1e5/51708507603.pdfIn PDF document text
    • http://usateatop.com/_upload/files/3853553200.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/51648269303.pdfIn PDF document text
    • http://short-story.ru/upload/file/xitubojimiliweruwefugawev.pdfIn PDF document text
    • https://ccskin.com/geektic/files/mutupofasurasotonafi.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/wutewudebizabiwimuwajos.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/727la9af319n7ml0ut6a8u0384/gopunurumimukovenu.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/jowolijugegi.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/21456041630.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/nekejofujaligapatajipipi.pdfIn PDF document text
    • http://glassick.com/userfiles/file/zadosusenoxawumume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sexting+emoji+apps+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_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 18256 bytes
SHA-256: 1af8d5712f364eb534c81962744e5028e9ca030ea304389de97c9c8ef3f80df8
font_01_sfnt_off00011c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001346d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346D 11104 bytes
SHA-256: 67b392736c7b1ad6c081819cc601409687858f8d4ecaa27c2a9a6a037acb7a34