Malicious PDF — malware analysis report

Static analysis result for SHA-256 698e1ef485a8a09e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-26 09:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 916af221483275b5b83bc1dd0a7ea1ae SHA-1: 662cd67d9d1e49ff8286f68c31dd3fcd5996ef06 SHA-256: 698e1ef485a8a09e1d034127463cec28f36d6d28c3a588ddffa141a1f2f8c26e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, indicating potential for malicious scripting execution. The PDF also acts as a link farm, directing users to numerous external PDFs hosted on various domains, one of which is identified as disposable hosting, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cosmik-kinoteatr.ru/sadm_files/nevigapefujasinirakikowo.pdf
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/rosifalapenuzogezigasega.pdf
    • http://myphamlulanjina.com/upload/files/jebuzawewixorotuwe.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/252393318.pdf
    • http://starma.pl/files/file/89377992016.pdf
    • https://corpus.bg/files/fck/file/82045140912.pdf
    • http://wannawwannie.pl/userfiles/file/wemutudujopomenevejimiga.pdf
    • https://vieclamlaocai.vn/webroot/img/files/zorawodelusiladuvumopasad.pdf
    • http://eternaseguros.net/files/files/37712036172.pdf
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/57411251971.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132abd4e9acd---36235539169.pdf
    • https://ekransamara.ru/files/35217006856.pdf
    • http://yjccnc.com/upload/files/kixevadisavuxiwalapov.pdf
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/96444031989.pdf
    • http://estatepie.com/files/userfiles/file/pinelufamifenida.pdf
    • http://worldnaturalfood.com/image/upload/File/92247083561.pdf
    • https://elesud.it/img_pagine/file/xiragamepubepuwetilik.pdf
    • http://abwingsmd.com/uploads/files/80926164220.pdf
    • https://stillwaiting.org/userfiles/file/5587864560.pdf
    • http://design-klasse.de/ckfinder/userfiles/files/vopilasixemi.pdf
    • http://labsshop.com/d/files/44452427290.pdf
    • http://gagutp.com/sa_upload/userfiles/file/20210901215624.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614efe156822f---84638394354.pdf
    • http://pes.edu.mn/ckfinder/userfiles/files/36045589113.pdf
    • http://studiomilano.eu/userfiles/files/23100915561.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+black+butler+season+2
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c585.bin
11c7307a71456d8b0b18019494393503811f8b0b58e79fd055071a7806c666fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC585 10680 bytes
font_01_sfnt_off0000de1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 16792 bytes
font_02_sfnt_off0000f630.bin
d99bedb88b4e151a5e1ceff36c89c1316717accf861ac6c9140f914c06843088		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 22720 bytes

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