Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f68f883e0878e0…

MALICIOUS

PDF

79.0 KB Created: 2021-05-16 06:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8373080ed0775319c82377473b066b75 SHA-1: 54c357961868b755e3104c193353d6d80b89425a SHA-256: 52f68f883e0878e09fdad10ba761d02841ef4bf49dacf4049afb6e9efec7884e
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, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to 'Geotech engineer salary', suggesting a lure to entice users to click on the malicious 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://mezovuduw.ru/strik?utm_term=geotech+engineer+salary
    • https://static.s123-cdn-static.com/uploads/4404740/normal_5fdd3e2614071.pdf
    • https://batuputuj.weebly.com/uploads/1/3/0/7/130739628/1149067.pdf
    • https://static.s123-cdn-static.com/uploads/4447267/normal_5ff17c01bccd4.pdf
    • http://febiterozoz.medianewsonline.com/introduction_to_mathematics_download.pdf
    • https://vetaroxavobu.weebly.com/uploads/1/3/4/4/134441067/sabum.pdf
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5fe73894e5887.pdf
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5fd6e1d2763d2.pdf
    • http://melukutirigap.22web.org/bbc_news_weather_report.pdf
    • http://vegofejolafud.mygamesonline.org/65516249922.pdf
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/meluvawu.pdf
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/9791116.pdf
    • https://mewarikubunaku.weebly.com/uploads/1/3/1/6/131637951/31d61489.pdf
    • http://resokipuga.getenjoyment.net/bodmas_rule_questions.pdf
    • http://tokesuditetu.getenjoyment.net/tulisan_arab_asmaul_husna_dan_artinya.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://riberudedanute.epizy.com/jakiwonapadatubes.pdf
    • http://jezevenakos.myartsonline.com/39590769732.pdf
    • http://gozuketitara.onlinewebshop.net/tratado_de_direito_penal_cezar_roberto_bitencourt.pdf
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_cc0f3fe863194195bc74cdade9f9db45.pdf?index=true
    • http://roveramo.atwebpages.com/color_atlas_and_textbook_of_diagnostic_microbiology_free_download.pdf
    • http://palakojum.rf.gd/form_meaning_in_kannada_language.pdf
    • http://laxuzoto.onlinewebshop.net/blue_white_flow_meter.pdf
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_fd4cb8e418ba435e84c3bdaf7ce6d92f.pdf?index=true
    • 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_off0000f5ba.bin
6d512a5261c6231a6f52ffdc352f7156262276bfb1ab35a5125875be5e143213		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 5196 bytes
font_01_sfnt_off00010771.bin
c7380383e0dc0b0480019ebae87ed83921e04460b927168e0c4415ff8c41f543		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 11588 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.