Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a41f6b2e478a80b…

MALICIOUS

PDF

78.7 KB Created: 2021-09-09 15:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a803b34cb8e7148d555b9197dc992111 SHA-1: de7aff62a60d45888e6d54c1fc24ea467e53c75d SHA-256: 2a41f6b2e478a80b31a337554eda357eb755a63d6725d86564da1c1e75d48298
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, indicating a link farm designed to obscure the ultimate destination. The presence of 'utm_term=link+to+steal+ip' in one URL suggests a potential attempt to gather user information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://aqs-group.it/userfiles/files/37085734235.pdf In PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/segalarajunimigonus.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/21612247877.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/vajozewurivelabe.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/mufedu.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/jenugekinijite.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/91084759232.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613088e748225---71306536463.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/26688688698.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/56749878229.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/nogunetogumelosu.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/51199626723.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/gutunuzuvotaf.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/nonimoxiziv.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/28700620842.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/95982499884.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090120523370554.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161307ce0bb309---44035285068.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/6705636687.pdfIn PDF document text
    • http://medi-sen.com/files/files/remixakizexosivulaw.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/65138581976.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/67668705303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=link+to+steal+ipPDF 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_off0000d04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE866 10192 bytes
SHA-256: 5fa44a54d38eb24dc70c936a9adc568de59016d7bcc59d550bc252bcb0abd5c5
font_02_sfnt_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 17724 bytes
SHA-256: f07ff9dced9e81e3bd3bbdedecc9147bcb8dd54640738bc87195a52fb8ffa086