Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1788bbeaa7f698e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-19 01:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d7ff94c2c5c6eea9f18ecc7f00902fe SHA-1: e8c9b2ecd794f0e7318d29ae0079e5817bb684e4 SHA-256: e1788bbeaa7f698ec6a6b7df4e5dcfaee6ac347669b1553ffb4c49ce59a14606
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a probable phishing or malware distribution attempt. The presence of these links suggests the document is designed to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://geoass.eu/userfiles/files/tovotedogukew.pdf In PDF document text
    • http://mmckno2010.zkosuchdol.info/files/18046234183.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/rolizodebalu.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210903104258_294271427.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/zetotegeginut.pdfIn PDF document text
    • http://klinok-saintp.ru/files/20879370732.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/wanutokilolonuti.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/94257029548.pdfIn PDF document text
    • http://getem.pl/files/file/mavugex.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/39869082063.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/fagadamipomu.pdfIn PDF document text
    • http://sro52.ru/uploads/files/62763239511.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/sujonada.pdfIn PDF document text
    • http://pedraferro.com/files/files/gisawutovusapuratefoz.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/jawepesewozovo.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/58994484345.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/33760392897.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/80958668383.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/19344906324.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/73487798937.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/fodobatademebumi.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/vodikusifopikufezupuboto.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///36772335254.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161353fec107c3---59472111160.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/58572419833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=hex+to+binaryPDF 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_off0000bc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8E 15408 bytes
SHA-256: 5f9348c7036a92cda04b442fbd95600b6ebd8c48b4eb47e44dd4347d3e00fc72
font_01_sfnt_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 10232 bytes
SHA-256: 050cc4cba0c22a088e958073d75d205440b56a0a31365744c75af97f91269682
font_02_sfnt_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1