Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e02e4ccaef3b5f…

MALICIOUS

PDF

68.7 KB Created: 2021-09-24 16:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7235f5acd466a21225b1e4ab2623c88 SHA-1: 8ffb3d5571e7bff01150713fcdb8359f6e96303e SHA-256: 39e02e4ccaef3b5f54d411e2fe78937d769421caf77b104550dbd119cc286842
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a Pdf.Phishing.Trojan. The file contains numerous external URLs, many of which point to PDF files on disposable or link-farm-like hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://medvor.ru/uplcv?utm_term=aio+streamer+android+tv PDF link annotation
    • http://firegallery.ru/img/upload/matagotarudibuvafemaf.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161378fc5ad3ff---81703228457.pdfIn PDF document text
    • http://micruts.org/userfiles/file/sufaxamago.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/77211372707.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/negatitovojiwiwabo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd96e67a56---97044611606.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/xotareriza.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/senerivosotun.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/92151357924.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/suvuxog.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/82333640164.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/11998688481.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/23456539782.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37395381544.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/41771673447.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/dokorulosugugat.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/vosoguzenopowukarerexu.pdfIn PDF document text
    • https://raljob.com/userfiles/file/rapafazewire.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109011319591716.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/15582580253.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/12134192567.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/fukazupediwawesanubawij.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/34712954184.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_off0000b130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB130 14268 bytes
SHA-256: 24bc072f79bc3a783031773344e21896e0ab949f122dcea6f2a303715033d5df
font_01_sfnt_off0000d4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 10412 bytes
SHA-256: 5bd0bf716bb25a71b3a55ee762cde29ed3cab3c5b68d2f331eb571034f8fe69f

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