Malicious PDF — malware analysis report

Static analysis result for SHA-256 71dd68c921872bdb…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 01:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15f54805d49ac5b269a9e8a36e46dc0f SHA-1: c396e4b9f6faa230945d17c6ffb47b28dac474fe SHA-256: 71dd68c921872bdb77962efb66aa720c82d2556bc2ce09983ad63cfff188b483
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to PDF files on various domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggests a malicious intent related to SEO manipulation or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://artin-intranet.com/ckupload/files/96755235328.pdf In PDF document text
    • https://ivanamihic.com/files/vejenoz.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/degexapanegiwusijonal.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/8775572077.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/22319567274.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/5125468185.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///86471124762.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/dexovawetazupejegawina.pdfIn PDF document text
    • http://lagrupacio.cat/file/vibulexitopobupef.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/65662912841.pdfIn PDF document text
    • https://ghnservizi.com/file/61870877284.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/16977416768.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/38019236470.pdfIn PDF document text
    • http://tayles.com/uploaded/maxiki.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/filiwabinuruw.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/radawutixejube.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/70007878798.pdfIn PDF document text
    • http://carbonelite.ru/file/23347631098.pdfIn PDF document text
    • http://rooptex.com/uploads/rowisuwa.pdfIn PDF document text
    • https://aaaxxion.info/images/file/safugidoz.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161304ccbcb8d2---kokasorep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=economics+for+healthcare+managers+pdfPDF 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_off0000d66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66F 11048 bytes
SHA-256: 8998d28c2088dd239b762bae0c890dc3acd6f84da64f864f6fc3b9d37151a8c9
font_01_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 16792 bytes
SHA-256: 097f6ca41a78343bce2c35e22777c3668809288c96a403a0c5d7023fc3a08484
font_02_sfnt_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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