Malicious PDF — malware analysis report

Static analysis result for SHA-256 699d89a2a6dbbe21…

MALICIOUS

PDF

70.8 KB Created: 2021-09-13 19:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4cdb3b31d34f959bb74f6c0dd9b1ae9 SHA-1: 558d591b4b178f5dee1c32d7e3d6e78f01cbc4a4 SHA-256: 699d89a2a6dbbe21ca0656d89684869b3a90ef8155aaeead3680066d8c2a9a17
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. Heuristics indicate it functions as a link farm, with numerous embedded URIs pointing to potentially malicious or disposable domains. The presence of external URIs and the link farm nature suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://yarpaket.ru/userfiles/file/gawuguxeregaruwevutere.pdf
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/6417127892.pdf
    • http://usairsprings.com/userfiles/file/90931743060.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/37766633760.pdf
    • https://kanat.com/upload/ckfinder/files/42487648934.pdf
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/18839358256.pdf
    • https://lifesmart.ro/ckfinder/userfiles/files/wemisakotutumud.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/2812007146.pdf
    • http://studiopiergentili.it/userfiles/files/pazezurezebenapovubudafas.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/pujulosifoxomesex.pdf
    • http://ossokahve.com/upload/file/60327059822.pdf
    • http://aarogyamedico.com/userfiles/file/38646808359.pdf
    • http://stjconsulting.it/userfiles/files/fekuxo.pdf
    • https://aptitudeclass.com/ckfinder/userfiles/files/15132079522.pdf
    • http://villa-carlshorst.de/sites/default/files/file/48597870669.pdf
    • https://mosconi.net/userfiles/file/sagisumaxeba.pdf
    • http://magicfood-cn.com/files/20210914001347.pdf
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/74694896391.pdf
    • https://concertwristband.com/resimler/files/lugejipipolorevoruxun.pdf
    • https://fundacjanadzieja.com/images/wyswig_images/file/76343469015.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb0b11cac0---48033291525.pdf
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/92687959747.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/00bb908e442d318adff953ecec6c411c/56924629798.pdf
    • https://bientannamhuy.com/wp-content/uploads/files/turukelewofer.pdf
    • http://greenglobepms.com/uploads/92704674244.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=az+screen+recorder+pro
    • 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_off0000b867.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB867 16792 bytes
font_01_sfnt_off0000d079.bin
1641ab05f0bf9c5dcd366e43d1f0e7ccdedf3e6c35b4740989e56d4be51b0996		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD079 15232 bytes
font_02_sfnt_off0000f6ed.bin
ee7abc5c81cadf7787ecc08775412e619831176e00be3e42dd81e4123f7b396c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 10152 bytes

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