Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad29d29da13127a4…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 19:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1df2870726d6aa3c80b0082f63382ba SHA-1: 50b957444de2eb47719320c5b966552082e68159 SHA-256: ad29d29da13127a43b1b036828e0bf713fc4f77f67d8c14486d6096a74818c9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates an attempt to create a link farm, a common tactic for SEO poisoning or redirecting users to malicious sites. Although no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://njshore.drinkpoint.com/uploads/files/pedegaxikutugotiguretige.pdf In PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/sanidiwom.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/numemesugevijijatobeve.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/fojozewusopekidoluba.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210902164412.pdfIn PDF document text
    • https://tavio.ru/files/file/43134749469.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/38864437127.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/56895099857.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161425da79e363---44588054252.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/90587859619.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/momosunowimijititir.pdfIn PDF document text
    • http://epmachine.ru/d/files/74498108200.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/47745115968.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/gogosajebirotupuxugeno.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/telififumene.pdfIn PDF document text
    • https://schmitz.cz/res/file/momebevu.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/80169367489.pdfIn PDF document text
    • https://pmms-online.com/assets/file/44705224391.pdfIn PDF document text
    • https://limsurempat.com/contents/files/xamoseboza.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/kukexijel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dice+game+androidPDF 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_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 17180 bytes
SHA-256: 94f5a3082e38b4c5a32cd1c61a466d58453776227a059644ebe11e7e953d4f99
font_01_sfnt_off00011abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D3 10400 bytes
SHA-256: f62e21fa2e7c1ee9090df303e0f75f9539f421b9ac5b0ee30559a915d41863e9

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