Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3f98ddb1c8a3ea…

MALICIOUS

PDF

76.1 KB Created: 2021-10-03 19:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 88db9793757946ddb6d1704feff1078c SHA-1: 284a2a98583071f590874c147367820a53662a1a SHA-256: 5e3f98ddb1c8a3eaa148979ad0cd18025042ca55b039b5e2fd7a737a855f7c47
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 pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://allytemp.ru/uplcv?utm_term=traditional+and+modern+biotechnology PDF link annotation
    • http://alfatreyd-mebel.ru/archive/images/file/xiwobigukuv.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210916042138.pdfIn PDF document text
    • http://rococosofa.com/files/files/25023796045.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/56865643368.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b0521ea440dd03e40b84720708e07e89/93625298848.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/nefeto.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/62686871714.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/wakis.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/somuwuzibuxigelazozev.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/18247505294.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/bogusekaw.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///99662736839.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/xeton.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/50544886862.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/77245347876.pdfIn PDF document text
    • http://hailiaquatic.com/UploadFiles/file/3602506817.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/21270489831.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/jirose.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/jomaxezovove.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/vozaxoxivunovezapub.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/rugufobotatonewazan.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/76756003363.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/62672706866.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/34074236050.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_off0000bed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E9 10868 bytes
SHA-256: 4b10a20d0a382dabdeea8b39ca4640d70a2917e0be0a8d5fb1092f00e7374e91
font_02_sfnt_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 19680 bytes
SHA-256: f8eb9204d95c03bf7f36a292612fe39c60b813439c3b676b395d47102a309ede