Malicious PDF — malware analysis report

Static analysis result for SHA-256 9844f2563d0b5880…

MALICIOUS

PDF

100.4 KB Created: 2021-02-05 11:17:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7ad026ae92ae8dcd1a17ccf6194abdbf SHA-1: bf6968180904f590bce7c911c8063599edabf4d2 SHA-256: 9844f2563d0b5880633d5bb9515c4dcc45de4e342e03a211ad2720387d6a78ac
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a treadmill manual, likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/aws?utm_term=cybex+550t+treadmill+manual PDF link annotation
    • http://koteyarn.moscow/kalnirnay_2020_marathi_calendar_download_for_pcmy4dt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_601c89dec449a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_6019535e77a19.pdfIn PDF document text
    • http://copyrighthelpbusiness.net/gilonapogjnfvw.pdfIn PDF document text
    • http://icub.tech/6847388069171dby.pdfIn PDF document text
    • http://vashastrahovka24.ru/rimafugirigolo33t7a.pdfIn PDF document text
    • http://trysalon.xyz/paditeguri3cx3a.pdfIn PDF document text
    • http://greenbike.shop/belbin_test_downloadj2ise.pdfIn PDF document text
    • http://subfamjtii.site/pexezcjhhj.pdfIn PDF document text
    • http://1fps.ru/alien_invasion_terraria5bwuo.pdfIn PDF document text
    • http://tuligofabuwisa.22web.org/2056816232.pdfIn PDF document text
    • https://dapunilak.weebly.com/uploads/1/3/4/5/134506399/3104873.pdfIn PDF document text
    • http://nakanilo.club/manette_wii_ne_s_allume_plusphqu1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ligunatiresid.epizy.com/spring_acrostic_poem_template.pdfIn PDF document text
    • http://pidezesu.rf.gd/20575652054.pdfIn PDF document text
    • http://putetudufotu.rf.gd/kujewixak.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C15 5272 bytes
SHA-256: e1577859455339c12e715e4e1e3f867c2a94f80479d04557f1099a52713cfaf3
font_01_sfnt_off00015df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF5 11156 bytes
SHA-256: 82e2a23f381faf9f163c2f7904d0552fda8899ccf30b4471b01f5913af482bfc

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