Malicious PDF — malware analysis report

Static analysis result for SHA-256 d405a711c802304a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-09 20:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09374d407de16271763305c057b75206 SHA-1: c4abbac8c7841dcebaff81126e70f1c369a9abf3 SHA-256: d405a711c802304a8aa7711b82aca47367db47b32ed98c4803b9cff65e25fcf6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm or redirection scheme. The presence of external URIs and the overall structure point towards an attempt to redirect the user to 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://unique-u.biz/images/uploads/file/sebesaxapitijanapimukoti.pdf
    • http://www.ximangsongthao.com/app/webroot/uploads/files/bebirazuwagemexapol.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161389cece49f9---25057914713.pdf
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/nasozituxemufagewezatiso.pdf
    • http://joyearland.com/ckfinder/userfiles/files/7552905044.pdf
    • http://kaizenlife.com/ckfinder/userfiles/files/26325407697.pdf
    • https://kapefashion.com/files/files/ruwonezotuta.pdf
    • https://bonaparte.cappencms.com/templates/files/18473501771.pdf
    • http://abnigakgdsg.friendship-match.com/upload/files/jowufezaweludeguvumefipon.pdf
    • https://yam-token.com/business_school/uploads/file/97866032558.pdf
    • http://7m-shop.com/userfiles/file/bimarufojiliwipi.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/cc85bad7e38c32b50800228973294b32/dafibefavarejamemaminap.pdf
    • http://z500.si/files/70522321564.pdf
    • http://bindashnews.com/userfiles/file/suxasa.pdf
    • https://porfic.com/fotos/file/87249073947.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/rudururozo.pdf
    • http://grandioso.asia/editor_upload_image/file/figitofenudubitoronolo.pdf
    • http://gazosilikatnn.ru/uploads/files/vubufikixapekapejor.pdf
    • http://pandoraecza.com/genelresimler/file/tuzopafozazud.pdf
    • http://headlinesdinerla.com/uploads/files/xefizorukagedevabil.pdf
    • https://girisimhaber.com/uploads/file/naxufavazifamaroferunugof.pdf
    • https://portalbime.com/UploadedFiles/New/file/38594057938.pdf
    • https://takarasushimn.com/userfiles/files/35349739034.pdf
    • http://autolavaggiocraparotta.it/userfiles/files/13432645671.pdf
    • https://mygrind.ie/userfiles/file/sepugofowixufeburiwiku.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=free+pc+emulator+for+android
    • 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_off0000ec0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 16792 bytes
font_01_sfnt_off00010421.bin
e2e7d193865b029819f51cafcae3dd66388a2c34c70d0b93dd4498b79fe88952		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 16784 bytes
font_02_sfnt_off00012f83.bin
e7400a9d4fd04db4af0f84fe9cc10eac1336ac176bca1476cd702a4eb6b1d4fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F83 10688 bytes

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