Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8779faac0199f8…

MALICIOUS

PDF

88.0 KB Created: 2021-03-31 23:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d8fe5d78b032a6682a3c79272ba1549 SHA-1: 731cf6802776cb067046ee75a6c0533dcfbbfbab SHA-256: 5e8779faac0199f87f3e4c88254c7211d9cd8bc5fd603c0cb6a57a13a76281e2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 https://zajinet.ru/strik?utm_term=list+of+gre+words+to+know
    • https://kuvobawodamelis.weebly.com/uploads/1/3/5/3/135350379/eea0188e61b1d8.pdf
    • https://wozukaziximuru.weebly.com/uploads/1/3/4/5/134587045/geboxewezexozulugo.pdf
    • http://xonibiz.22web.org/does_amazon_give_stock_to_employees.pdf
    • https://vanevuzitikuge.weebly.com/uploads/1/3/4/5/134588875/9971331.pdf
    • https://latoratepowubum.weebly.com/uploads/1/3/4/7/134713938/7949759.pdf
    • http://zitukuzagipu.iblogger.org/how_to_fix_leaky_faucet_handle_delta.pdf
    • https://pewatusikowago.weebly.com/uploads/1/3/2/6/132683224/776666.pdf
    • http://mebosopevux.iblogger.org/kelibij.pdf
    • https://gifofelonapa.weebly.com/uploads/1/3/0/7/130775883/24a9325caf3a3.pdf
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/mubuludojimi.pdf
    • http://julaximufe.66ghz.com/angina_inestable_elsevier.pdf
    • https://vimavaduziwali.weebly.com/uploads/1/3/1/8/131856569/rabowil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bbd51788-1ed3-4df9-9457-826fdf6bf2b2/how_much_to_learn_graphic_design_in_nigeria.pdf
    • https://uploads.strikinglycdn.com/files/eade5ca6-1c46-4514-93ef-4433ca6d4356/jawotatutipaz.pdf
    • http://jekivuzogir.rf.gd/josagozukuwa.pdf
    • http://dojiseb.epizy.com/gerunds_infinitives_participles_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/f364ab0f-9cd8-4ca1-a022-41d2ef578a93/93046208447.pdf
    • http://noxumalog.onlinewebshop.net/vibotumekufumupowaver.pdf
    • http://lumosaneja.onlinewebshop.net/soft_skills_notes.pdf
    • https://uploads.strikinglycdn.com/files/e972c90c-3232-4be5-8c08-ae744f50b78c/how_to_use_oster_blender_food_processor.pdf
    • http://tititogejeda.rf.gd/leaps_beyond_the_wonder_weeks.pdf
    • http://tigesafapowe.epizy.com/92503422956.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_off00011cd3.bin
15129b6cfa2e5b3f2f15b522141466151c5e7cbb8249602bb109b01612cd78e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD3 4928 bytes
font_01_sfnt_off00012dc5.bin
98a6b6ef3981ae58d993c45de48362c3b559c3c5bdb648e59de2d36a11cca073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC5 10932 bytes

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