Malicious PDF — malware analysis report

Static analysis result for SHA-256 5797ed9a92dbb416…

MALICIOUS

PDF

75.4 KB Created: 2021-03-10 00:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a26d9224f2d9b7f2278e795f8d3ac33d SHA-1: 09216c9ac8ce8ab0416130c99eb15eeae2ac9df4 SHA-256: 5797ed9a92dbb4162d757f497a7ea7ac31e4326c24cc5d2bad19535cbf9fd58f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, which is characteristic of a link farm or SEO spam. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://leonvi.ru/123?utm_term=masters+exam+routine+2019+pdf PDF link annotation
    • http://gordei2d.com/where_to_buy_foam_paper_sheets5mj3y.pdfIn PDF document text
    • http://about-central.com/soil_mechanics_and_foundations_by_dr_bc_punmiaqhnmi.pdfIn PDF document text
    • http://nuneriwu.22web.org/formation_agriculture_urbaine_gembloux.pdfIn PDF document text
    • http://naturmilans.fun/poughkeepsie_tapes_netflixbhpgy.pdfIn PDF document text
    • http://wacc-cat.org/617782495384xn3c.pdfIn PDF document text
    • http://dashcamtopbest.com/28176729946z668r.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/jofoxavu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_c4acd06b2d034a91a282522f941075f6.pdf?index=trueIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_589e66f38a2c4b5bbe60e71b1ac966cb.pdf?index=trueIn PDF document text
    • http://gewapapis.epizy.com/smok_alien_220w_manual_espaol.pdfIn PDF document text
    • http://xogaxuf.epizy.com/vogubap.pdfIn PDF document text
    • http://xasagamuforokek.rf.gd/how_did_the_wall_street_crash_affect_the_great_depression.pdfIn PDF document text
    • http://bawexoji.rf.gd/tivupifexogamel.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_969cc5ccd7594df780d817e4998ce11d.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_15ea825d1837443bbe32e8a737cab0ed.pdf?index=trueIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_e7fd67bbe75d41919cc78e35867f189f.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_15c5b2a36c564dc291ff53c76f3c8c63.pdf?index=trueIn PDF document text
    • http://fukefuxatolu.epizy.com/surifuri.pdfIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_a218f61e88d845739058425fe1852cb1.pdf?index=trueIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_d4243ece49a4491aae65ac35fe1b8f57.pdf?index=trueIn PDF document text
    • http://rabelinowizufe.myartsonline.com/lee_county_florida_school_calendar.pdfIn PDF document text
    • http://zokitidekav.epizy.com/48162719218.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_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 5712 bytes
SHA-256: 7aac87ccf35ddfd040208fc17b2cb8c5aee7f07b5830472d67d3b27744faa6b7
font_01_sfnt_off0000fc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 10636 bytes
SHA-256: a1c14685384292a66ce5ebc27103f2ccde0824908c789ac67f1cf3d528af4537