Malicious PDF — malware analysis report

Static analysis result for SHA-256 c725cf4f488a839e…

MALICIOUS

PDF

78.9 KB Created: 2021-09-23 10:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b8f322d742d11dc9e258d26014344687 SHA-1: 262b43fd861dc3a853cb929e8e0dea6ec56f0f90 SHA-256: c725cf4f488a839e4fa1e1f2e2e0895caa680a8567994b8a6d885ffeccea4fdf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a likely attempt to redirect users to malicious content or phishing sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=openvpn+for+android+config PDF link annotation
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/vasiketogudawak.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/xowuxigovurupipitipivibi.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/kelane.pdfIn PDF document text
    • https://izometal.net/mm/file/guzemoxidowaxoreberos.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/2fdfe003eaba6352923f391711e1292c/15910272164.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/65537208521.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/furivexesijop.pdfIn PDF document text
    • http://humanlitech.com/files/files/gijaxodemujimomeder.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/boguvu.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6b01e356aeedc0c6f903d45715a7defb/90888516422.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/78948367861.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/56435072891.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/54075315012.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/7126903765.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/safuzanitonejugexabadexif.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/76240189139.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/xexokigagifavawe.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/12890193170.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/labagozojewer.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/50388613528.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/32387765375.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/33370748371.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/61527998272.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/19732143652.pdfIn PDF document text
    • 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_off0000cea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA6 17884 bytes
SHA-256: 0beb1461e14a243c570431a577dc12aa8ca57f3145e3fce34ff1ca510e2ef5e8
font_01_sfnt_off0000fd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001157d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157D 10572 bytes
SHA-256: b474b19c891fdc768248687eb8c3c87f2d1e68a9d8c642a13bfebf725b08768f

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