Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e632456265ef13d…

MALICIOUS

PDF

70.2 KB Created: 2021-09-16 12:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2f2deff3955dc04c9f9d02e809bf0c43 SHA-1: 030e6aa2bfa99be40aaf64ed1c04d137bbe8ed15 SHA-256: 5e632456265ef13dbde59116ea33fe1d617fd130ca665beaa3899944739555c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=rebtel+mod+apk PDF link annotation
    • http://jimsclub.net/new/board/img_tinfo/file/20210905163548.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/surube.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/wawubekituwidexeniro.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/bunarabojiziziwifomozafoj.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/87690951492.pdfIn PDF document text
    • https://jensbrode.de/files/file/5275655513.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/25845418145.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/36617158555.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/73979338837.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/wubelukirufisatez.pdfIn PDF document text
    • http://napiarsaigh.com/images/mewudu.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/loxuriwumediwuzu.pdfIn PDF document text
    • http://petrduchek.com/files/nilumu.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/61913454704.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/35250473625.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/fefupizikune.pdfIn PDF document text
    • https://conrays.ru/f/data/58603404359.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/74739066753.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ce76be44b---xudividokodedonajo.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/56148938592.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/30259997867.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/magasivep.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/40013263415.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_off0000b3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E8 15824 bytes
SHA-256: 85ed6642fca9fd87b32528073efd9392caaea08b21b8b54551dc87169d4c5bc9
font_01_sfnt_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 10364 bytes
SHA-256: e8e9ccd5d8b2ff2e2ba8d8f671a7b845aff6943b00c8967738cd8afedc83af75
font_02_sfnt_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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