Malicious PDF — malware analysis report

Static analysis result for SHA-256 de716e560eb1388c…

MALICIOUS

PDF

91.8 KB Created: 2021-09-22 17:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 62b805c8b5b4202eba7a00194ed62f45 SHA-1: 75360c0abd2c1f0470592691751766a78e76343b SHA-256: de716e560eb1388cfe4bf43617a10cf9c2e55bc82ffbdfa00d7489935710d50a
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 a large number of embedded URLs pointing to various domains, indicating a link farm designed to redirect users to potentially harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting the use of disposable hosting and UTM parameters, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=android+tv+email PDF link annotation
    • http://almawred-sy.com/files/adminfiles/files/tosig.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140fdb68415b---76537619418.pdfIn PDF document text
    • https://wrd13.com/force/file/xikibulizakuzatujebovomup.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/57250502396.pdfIn PDF document text
    • http://goldia.cz/data/file/bopijomamasotuxadula.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/fesokotedelorupagefikuvef.pdfIn PDF document text
    • https://0900107678.com/upload/file/25819889728.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/52773834102.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/52738650895.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/27229441304.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/38930549544.pdfIn PDF document text
    • https://flomogroup.com/upload/files/47147892030.pdfIn PDF document text
    • https://nppgursaraijhansi.in/ckfinder/userfiles/files/47898168883.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210910200137.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/94644470962.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/85826797263.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630650836.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091722200873499.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/24520886400.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/2560249524.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/pevatusirafufukevolag.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/28252681878.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_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 17880 bytes
SHA-256: a4729f8df47c8f93a9f08087ec209701fd5825aa65934316facf3c048f3d74d3
font_01_sfnt_off00013274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13274 10288 bytes
SHA-256: 5a7677fd6fa2ba15141c05f0e567c5c0d96ef87847ca954013246b407acbf883
font_02_sfnt_off00014995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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