Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab779fa9b49148f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 13:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 605ced2dfb94ef0590aed491fe580bcd SHA-1: 7d3e16206c86058ea0dc7819fcc9894d8ea9165c SHA-256: dab779fa9b49148f6dee0e000c49707746cfbc9cbade1e76bbb3a96cde482448
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous URLs pointing to disposable domains were extracted, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://erimti.com/userfiles/file/13832960044.pdf In PDF document text
    • http://annabarons.lv/files/files/55932820000.pdfIn PDF document text
    • http://rivucota.com/upload/files/mojojedepuvazewagodeg.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///mafugudifosetopafexilene.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/46629444988.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/8856247901.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210906_135246.pdfIn PDF document text
    • http://preiss.at/upload_files/files/20579213158.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/dunokojizuzupadap.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/fekuxizilomarilibimoteko.pdfIn PDF document text
    • http://crediramasrl.it/public/file/97821762745.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/zedufasozavesamewafix.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/94452772774.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/ramefabo.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/32388731445.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0a5795699---dipotetaguxup.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/94435220789.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/44474076864.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/90988972987.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/79669736184.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/wozalazej.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/99974061975.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07bd7d026---85050792790.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/tosutunovikodorujisol.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/pezinolimegoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=360+player+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_off0000d433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 10596 bytes
SHA-256: 09bcaa4e509055372eea582390692e101fb56daf4c6fd57172a8eb4894c698f1
font_01_sfnt_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 18124 bytes
SHA-256: 037f8fa45b17c6103a77d80e92c78261cfb37178b3a93a4d1e87d2d5c6d59dd1

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