Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f6725ec32b6d62…

MALICIOUS

PDF

84.9 KB Created: 2021-09-10 00:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7451f91876297b296b4e24f57b1f8bb3 SHA-1: b53c6b3f48994026f4068083de6ddae63b5eb8e9 SHA-256: 64f6725ec32b6d62be96bdc8b351c87ce0846caf98038e48bb62975a9c86345d
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, many pointing to disposable domains, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ed-web.cz/userfilesfile/wimiwivitibivofopudofe.pdf In PDF document text
    • http://digjamaica.com/app/webroot/files/53372931407.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/wegesanivobofodidati.pdfIn PDF document text
    • http://kag.fr/userfiles/file/56325334473.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/tizufutowelerefuwaje.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/wewero.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/jivodivefiritogodol.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/72736751785.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/muzexifojevajajivubutabuk.pdfIn PDF document text
    • https://agrando.cz/files/file/wefizifizane.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/38326894877.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/81998507218.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/womivunogufojuxi.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/84465998165.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/89729140617.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/38245603436.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/76928938843.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/23100325536.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/24263573565.pdfIn PDF document text
    • http://ge-mak.com/files/4036525691.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/towibutilenubesusoluzizi.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/9036873966.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/fepumovawomojoturak.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/mivosasatijegupepizaxu.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/57288017095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=instagram+followers+for+private+accountPDF link annotation
    • 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_off0000e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 11028 bytes
SHA-256: ddfd0364847962e11edae52f5de0cc11368c6d4733f13250f8861d271d9be552
font_02_sfnt_off00011408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 19188 bytes
SHA-256: f19144fd7c2558a422f0138fb911274778b19b2ced2fb6403e9c630d07e06e49

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