Malicious PDF — malware analysis report

Static analysis result for SHA-256 e01d23538086250c…

MALICIOUS

PDF

74.5 KB Created: 2021-04-15 03:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bc6d73ac7b252e1f915ff528f2717b4 SHA-1: 7e81e02b267beb3cbc40b705324becd29009b748 SHA-256: e01d23538086250cf3b3893533b69cc71e0709b4c3c4859e59a59f44e71c30c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which are hosted on seemingly legitimate domains but are structured to appear as web form submissions. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct hosts and links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.osgeurope.com/sites/osg-corporate.dev/files/webform/14219433733.pdf
    • https://ambrose.edu/sites/default/files/webform/seliruni.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/vawutudujenopudup.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/32041770382.pdf
    • https://ambrose.edu/sites/default/files/webform/11364316539.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/99469138220.pdf
    • https://www.jts.org.jo/sites/default/files/webform/86196288468.pdf
    • http://russian-ice-spb.ru/sites/default/files/webform/files/97818084314.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/13178745316.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/tuwagamutavuvefofufeniz.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/palepipob.pdf
    • http://portal-mysigma.com/system/files/student-proof/72808970040.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+bible%2527s+hidden+secrets
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e734.bin
acaa52f4578f896fcb7afa1fc4bad7e486d914b54d1e13f10933d6bbb05efc3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE734 4940 bytes
font_01_sfnt_off0000f7fc.bin
ff6c4b0c5d51164de4620188f811d0096db038135977dd7944131a388a882268		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 10928 bytes

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