Malicious PDF — malware analysis report

Static analysis result for SHA-256 1feed3e5afef2e70…

MALICIOUS

PDF

69.4 KB Created: 2021-09-14 02:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39d4f96bbb209efd7bc8fc3497b67267 SHA-1: f2a54443c2e5da0bb8368ddbc6de3b8b9d7526f6 SHA-256: 1feed3e5afef2e7032463ac8ca8a68ee3ce360116e2c4934b716ed4646dbd86a
126 Risk Score

Malware Insights

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

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 other PDF files hosted on distinct domains, suggesting a link farm designed to distribute further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, indicating a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://brixtontaxi.com/survey/userfiles/files/magepowixoxebumebinokaz.pdf In PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/vidutubijisut.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/kixobuguxegevemusawamu.pdfIn PDF document text
    • http://maidichike.com/upload/files/64407511416.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091320435937.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd58f8779e---kerasitazinokawolezunit.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/ruzeza.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/bonujagukigezajurapoba.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/basaje.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/90912995269.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/38712416260.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/gapabudejodiwipefufab.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/1381712961.pdfIn PDF document text
    • https://magerp.org/upload/files/tajepufidudajuvajixa.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/46434458878.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbea57976d---kelupizegavufomiwuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cute+wallpaper+for+mobile+phonePDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/xunezosabivelomexa.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_off0000ad74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD74 16520 bytes
SHA-256: f5bdab1dc318493ee9878783f3e53e56b293bee0d4e8425f54c053ce7a5cd93c
font_01_sfnt_off0000d815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 10812 bytes
SHA-256: 0283532c029e41081337547db203351940774e7dcdf699e760bb273d8e007aca

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