Malicious PDF — malware analysis report

Static analysis result for SHA-256 999e550b570eec2b…

MALICIOUS

PDF

79.0 KB Created: 2021-04-08 09:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4a006cd32f55dc028e7c65614a80bd6 SHA-1: bc72ace7778bfd336cb420cff989a772592cdc0f SHA-256: 999e550b570eec2b917f446469236607fb3de2564c4f58830bab3424a4ba66f5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://kuzutuzo.ru/strik?utm_term=what+does+it+mean+to+get+your+roots+done
    • https://cdn-cms.f-static.net/uploads/4391317/normal_60136d9c28cfe.pdf
    • https://kifowufowuvix.weebly.com/uploads/1/3/5/3/135392599/zadawo.pdf
    • https://static.s123-cdn-static.com/uploads/4453720/normal_5fde760675afb.pdf
    • http://dektesheff.xyz/trig_function_calculator_sin_cos_tanmdxov.pdf
    • https://cdn-cms.f-static.net/uploads/4423460/normal_601b4c0d909b1.pdf
    • http://seviregigaguz.22web.org/86489402221.pdf
    • https://cdn-cms.f-static.net/uploads/4481157/normal_605c685176c40.pdf
    • http://8gusevshop.website/unnatural_selection_bookbly45.pdf
    • https://static.s123-cdn-static.com/uploads/4418385/normal_5fe0ffaaca35e.pdf
    • https://nafuxiba.weebly.com/uploads/1/3/4/0/134097784/f7ef97.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://wadarudi.epizy.com/bolaza.pdf
    • https://fae5df41-d68b-4d62-9961-cd33801cec7e.filesusr.com/ugd/f52c73_bd8f66cd2ca24457af1d981f5d952654.pdf?index=true
    • http://budunasetixap.epizy.com/durbin_feltman_scouting_report.pdf
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_d305c5fa90e44e4fb801f5eccd8aa20b.pdf?index=true
    • http://nabikelotedabe.epizy.com/baptist_faith_and_message_2020_study_guide.pdf
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_cf5b7485384e47bb9ef94a55dac1afef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e87b.bin
4a1b7e27e918379505cfc046338af9e4b056c9823e750bc79969c2b129b038d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 5204 bytes
font_01_sfnt_off0000fa12.bin
e7d28ebd25e7a147ae999eb919e0696a854b33cf12e4c867896ceb6e776874e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 10932 bytes
font_02_sfnt_off00011f51.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F51 4324 bytes

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