Malicious PDF — malware analysis report

Static analysis result for SHA-256 f803eb8c2584e5f5…

MALICIOUS

PDF

77.2 KB Created: 2021-04-02 12:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6f11362bdad31cf116449bcf6cb430d0 SHA-1: f31abad33242723725daf8e33fa05e8eba2782d2 SHA-256: f803eb8c2584e5f54d93eaebad881f2aad7b86d1df3c2d9fdc2d9a8b2d66a8b9
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 pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily obfuscated, contains keywords related to a 'US military base in Stuttgart Germany' and 'wkhtmltopdf', indicating a lure to entice users to click on the embedded links.

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://seumenha.ru/strik?utm_term=us+military+base+in+stuttgart+germany PDF link annotation
    • http://mopasiwamosul.iblogger.org/92176123815.pdfIn PDF document text
    • http://tasusala.iblogger.org/60419484895.pdfIn PDF document text
    • http://mexicotop3.xyz/13850707675co6lc.pdfIn PDF document text
    • http://sodalabs.pro/what_is_the_empirical_formula_for_benzene_c6h673hiz.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://sujovageje.22web.org/actemra_package_insert.pdfIn PDF document text
    • http://vukefof.22web.org/business_process_management_ebook_free_download.pdfIn PDF document text
    • http://zozitaze.mypressonline.com/yamamoto_new_scalp_acupuncture.pdfIn PDF document text
    • http://taxafig.66ghz.com/cover_page_template_chicago_style.pdfIn PDF document text
    • http://verifybadgesbusiness.com/nubejavonamikih0ylr.pdfIn PDF document text
    • http://lonemap.medianewsonline.com/4377938057.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nufurezoguboli.epizy.com/72501485649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9872e1f1-b831-451f-8c8b-882799db03e0/81880466450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/079700f8-3270-47f0-b9f0-60049b2daa05/medios_de_comunicacion_que_existen_actualmente.pdfIn PDF document text
    • http://mutupoda.rf.gd/tobexujudogatebutelu.pdfIn PDF document text
    • http://xapopifatudafa.rf.gd/how_to_change_time_on_citizen_eco_drive_e820.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_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 5240 bytes
SHA-256: 7c8cb50bc1f5e7b936bd51b10d9927b2c5e7c850fd7b93264eefb423e021cf96
font_01_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 11264 bytes
SHA-256: 7742935da8dc065d1977f9a0db46605a343be38fb8465e39d2ea86de7534da50

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