Malicious PDF — malware analysis report

Static analysis result for SHA-256 5824dcad2015c34f…

MALICIOUS

PDF

85.3 KB Created: 2021-09-08 17:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c0872fa7424b2643e4fe8d52e3d95d1a SHA-1: 0cb4aab8e8b00a850405d35995d6850d99bd6b70 SHA-256: 5824dcad2015c34f1366f38f257f49b296514c2442e7fd0c5cd49a0f97305ddd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, including one with a 'utm_term' parameter suggesting a tracking or phishing lure. The PDF also functions as a link farm, directing users to multiple disposable domains, which is a common tactic for distributing malware or conducting phishing campaigns. No scripts were extracted, but the presence of external links and the overall detection indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=netflix+recommendation+algorithm+pdf PDF link annotation
    • https://ottopianos.nl/files/tojevovivid.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132335a8a54c---xijopebugevem.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/29249803226.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e847a681a283c79941cc4c4f793de842/fuwik.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/79967870993.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/jikamuvisibubamovabiruw.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/sijepupiweke.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/dudupiwefirixo.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/fujijukad.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/46097349787.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/82512802557.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/rujetef.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090616080373499.pdfIn PDF document text
    • http://precisao.org/files/files/lanuxopaturemub.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210903013648.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/37840165698.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/68770233249.pdfIn PDF document text
    • http://briztravel.com/upload/files/91114749460.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/89949383321.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/7570165250.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/71571443014.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/1317714766.pdfIn PDF document text
    • 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_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 17472 bytes
SHA-256: 0a08bc30904d395f71d9f79b6019b8dd6e42884bb754c67d8d3039f72f52e31c
font_01_sfnt_off00011680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11680 10976 bytes
SHA-256: 855e0f7e58d667dc13d01ca2ebe59f438e275483fe8372b2e8b9e15925b8737a
font_02_sfnt_off00012f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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