Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd7defb6b3ba9b1…

MALICIOUS

PDF

74.0 KB Created: 2021-04-25 01:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59cc35cc3c5a3bbf46939965c82eae82 SHA-1: d54e51e189006a31be033b6b92709f0808abd471 SHA-256: 1dd7defb6b3ba9b1fcef75dc093677f72caa2aba789fc634174be507a9250ea5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are structured to appear as legitimate document downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://klm3fg.grhosting.cz/sites/default/files/webform/files/tekuxegejarikuferibo.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/susumijifiwef.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/mulakipezumaxusilexuvu.pdf
    • https://ambrose.edu/sites/default/files/webform/71027525942.pdf
    • http://russian-ice-spb.ru/sites/default/files/webform/files/69309865186.pdf
    • https://ambrose.edu/sites/default/files/webform/lajeriz.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/604022749.pdf
    • https://www.jwico.com/sites/default/files/webform/kupoxogij.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/13349970620.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/lozege.pdf
    • https://www.telluridescience.org/sites/default/files/tstc-applications/30232074114.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/34904816646.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/30106672217.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+are+the+principles+of+logic
    • https://lib.asu.edu/system/files/webform/sikukuditizituxabisezopel.pdf
    • https://community.princeton.edu/system/files/webform/fivedexexefo.pdf
    • https://www.vub.be/sites/vub/files/webform/rifavuzido.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_off0000e1a8.bin
5cb9216cd5ba8abf7cb1773188a3f3a5757a640a070ea6bc1f8d251652b6d600		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 5288 bytes
font_01_sfnt_off0000f3b5.bin
10d2bd2fa2697e2c8c93477db6dffba40679a80322f44da4aafed1a3ac428fdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 11868 bytes

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