Malicious PDF — malware analysis report

Static analysis result for SHA-256 44eb728882447a43…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 03:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3aa915d7c1e1bbcb541e0a003b49b2ae SHA-1: ccf4581f803e454cf439573a3c798a64c1721ef8 SHA-256: 44eb728882447a43e201b06bc7a8018df1c961da4a82854aac5fd7cfc58e9639
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to external resources, suggesting a phishing or redirection scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the PDF is used to distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://orosweb.hu/userfiles/file/vanuzilesas.pdf In PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/semibupakenirokabenowi.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/p1jhqt31942prubp7r9r31qpt7/sebos.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/kimatokajezux.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/tekepapun.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/86638351735.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/92277854148.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/7890757333.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/lezutojobudupiz.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/83131590045.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/fomilesixofizipibiwosob.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/tuwutijumeta.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/mezorolotuxupotozib.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16325118622259.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/52424935672.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/69389465362.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/mowuvagifapabajutewitenu.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/puvejijufadod.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/bomepurezopuwosijok.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/govowixaxaboduniralubosu.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210920065952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+update+rooted+androidPDF 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_off0000ac8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC8F 10348 bytes
SHA-256: adb34aadd05c6d43500b7f81ca9fc3b42dba2c3d1b80608069c9de8ac6fc0eb1
font_01_sfnt_off0000c3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FC 16004 bytes
SHA-256: a7f42da04456c90fe7d5b83ac9612493a22b448fe0e06722e9cab9467ea06b25
font_02_sfnt_off0000eca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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