Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e89360aa5e7264…

MALICIOUS

PDF

75.7 KB Created: 2021-09-28 00:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de39b4a1da634ef7a2f4450b6e6aa25b SHA-1: 7bf6370a625ee2ad7d58287bd67d574c916f51f8 SHA-256: 16e89360aa5e7264ac72799056add8c579c255ae7d155b392b020650ae615bb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 unknown PDF files hosted on various domains, suggesting it functions as a link farm. The presence of external URIs and the overall structure indicate an attempt to lure users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/jusubixijibamer.pdf In PDF document text
    • http://www.companyforte.com/imagenes/editor/file/xaguxow.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144732add0ff---fanikovafexilutofibejowu.pdfIn PDF document text
    • https://magerp.org/upload/files/mulejeduxoxavoviz.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/71724840041.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/dujokidilasumorolumiju.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/859be9da4b6a449e78285e81a4ea1290/lidipe.pdfIn PDF document text
    • http://farashimirooz.com/files/25388517266.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210916005329117.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/14645004188.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/vozorebawijezek.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/63420127428.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/regomapud.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/tujuvewid.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/54096357991.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/86231297307.pdfIn PDF document text
    • http://getdol.com/page_data/file/dimedalaj.pdfIn PDF document text
    • https://trakyasoftavukatwebsitesi.demowebsiteleri.com/upload/files/62702843697.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/30569042223.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/miwukiwirefubonevi.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/tekutasolebe.pdfIn PDF document text
    • https://transturist.transturist.com/ckeditor/ckfinder/files/files/39687324936.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/wegudotevakazijexol.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/100669039361370c9f05027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+power+management+settingsPDF 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_off0000c167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC167 10756 bytes
SHA-256: 6b803c39ff8b7eaf8f7adb390c8d3873b06b3213677f086f9dbed8478f5b36d9
font_01_sfnt_off0000da01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 18264 bytes
SHA-256: fb9b6406f64264b70f0edfa9e9320cec4f93ac3b0ad2f12ffb0842ea6545b43c
font_02_sfnt_off0001091a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1