Malicious PDF — malware analysis report

Static analysis result for SHA-256 3903e85b8377271a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 01:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 19b308954918ca77dd939d718151d29a SHA-1: bd3c484352dc1647f8f259b945b6f8b2ba489f1b SHA-256: 3903e85b8377271ac552243b3817fba9c700d9f385f559cef48c357ec642a30f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or redirection scheme. ClamAV and ML classifiers strongly indicate malicious content, specifically identified as a phishing trojan. The file's structure and embedded URLs suggest it is used to direct users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=the+seven+deadly+sins+season+2+episode+1 PDF link annotation
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/dapagepuxawe.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/43398982173.pdfIn PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/retodigezanufam.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/62848254652.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16138397d095f8---81247837312.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/65776413601.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/dosegegivok.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/lanisufoxubotenazisosow.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/11451875703.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/21573776546.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffb24d57ad---kabunanoxer.pdfIn PDF document text
    • http://msiutilities.biz/documents/14383756361.pdfIn PDF document text
    • https://baongochoa.com/upload/file/jinesaju.pdfIn PDF document text
    • https://eclearusa.com/images/file/mimalifojofuforubojanu.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/fevufutomitidigu.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/pujivanukikozew.pdfIn PDF document text
    • https://esz.jp/img/editor/files/83890928909.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/nexemipokowikapewufu.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/ruzoviliroxovoxopalo.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/mejefuf.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/66155051382.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/goxaduloxilunobu.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_off0000dac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 18696 bytes
SHA-256: 72d26e502b5cc4798dcc163f72ed7ee2f6cfea752d4e67ed4a793c54ac9af435
font_01_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 10604 bytes
SHA-256: 138f545bfdcbf75218432195b66034217bcccbc05ae10afec260faa78a7ef461
font_02_sfnt_off000123b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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