Malicious PDF — malware analysis report

Static analysis result for SHA-256 2724a1258a59b2f8…

MALICIOUS

PDF

70.7 KB Created: 2021-04-17 17:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03cfa9fc19a7bf651c45a3cde6e1c78a SHA-1: 38b6fd814fdf63f86407ef08c015ae666e4ac9d3 SHA-256: 2724a1258a59b2f8ddf6e00dbaee46199108eae5d6b82038bdda1fb2061f8a5d
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious or unknown domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document is designed to host many links on disposable domains, further supporting a phishing or malware distribution attack pattern.

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.jts.org.jo/sites/default/files/webform/nisegat.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/memirudomonejusowanasu.pdf
    • https://www.jsif.org/sites/default/files/webform/vinuriruxelapaviwona.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/51762260361.pdf
    • https://www.mainephilanthropy.org/sites/default/files/5296457674.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/dozigax.pdf
    • http://www.friendlycc.com/sites/default/files/webform/kilolegejesap.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/wogudodijanaferewinige.pdf
    • https://ambrose.edu/sites/default/files/webform/28961662769.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=singer+pro+finish+serger+problems
    • https://minorsoncampus.princeton.edu/system/files/webform/fujixedapilevunagujos.pdf
    • https://lib.asu.edu/system/files/webform/46247033309.pdf
    • https://community.princeton.edu/system/files/webform/luzixuganigofifabeja.pdf
    • https://gradfutures.princeton.edu/system/files/webform/25860956451.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/posilo.pdf
    • 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_off0000d85a.bin
0f14b4d1717d0cb4ea1c16ebbb63d13e93c07f4f95108471a30cd46230344334		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 5348 bytes
font_01_sfnt_off0000ea63.bin
ab1628a4346d218e188c0d5a49a6286dfe72038dab5a8d184e6755ab38f53182		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 10400 bytes

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