Malicious PDF — malware analysis report

Static analysis result for SHA-256 625f5c326ceb2f8c…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 01:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d58ac7a8d320a62e5ece6850deb48686 SHA-1: 7f946a4106a136e2bcedc93892ed13928a4d0dc5 SHA-256: 625f5c326ceb2f8c87093abbcefd2ed79d3350f74ef5816628795e96840ba80d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic point towards a lure for potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=proxy+premium+apk PDF link annotation
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/sigazigumakalid.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/42869998638.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-14/images/files/muwasotutusi.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/74047458239.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/rikeje.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/loxotuwozevagizub.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/banojoxisog.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/53788374474.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/47144975202.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/gb4irqk8gh7bmnumq10qmfsgd9/wedavelewotobo.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/rujelir.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210925175928.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/28793560620.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/48376462335.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/71713740670.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/38699537047.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/jamixifuretewe.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/wufum.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/90345828247.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/fanudofegapibefo.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/27273172754.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210914162511.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133155fc3274---nazibe.pdfIn PDF document text
    • http://short-story.ru/upload/file/91536850878.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_off0000afb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB2 10408 bytes
SHA-256: 1c34bdbd9284cbda5687e8b18276174561e60a1c4af0e5493f87fc40dc3f439c
font_01_sfnt_off0000c74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74A 15400 bytes
SHA-256: 2352d6f206b37ee4d2a99677c28ba23dc10a4edc5641e5bf83b8daa24a6bd3b0
font_02_sfnt_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1