Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cde8f5b182ddd50…

MALICIOUS

PDF

61.6 KB Authoring application: Serif PagePlus
MD5: cb2fbf39b4b22f5714798d41e3638c40 SHA-1: 18538a3852d93fcfae5261f7ccd301606f6ac6f1 SHA-256: 5cde8f5b182ddd50f7a7889bac55e841acdd68b9951089b4cc90437dbff0b0f7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs pointing to external PDF documents, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.TtraffRobotInstall-7605656-0'. The primary attack pattern involves directing users to a vast network of linked PDFs, likely for SEO poisoning or to serve as a distribution point for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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 http://juminer.fazenda2.ru/uploads/2020/01/27/b449ccaf6c.pdf
    • http://vutufekave.roda-climate.ru/uploads/2020/01/27/3978837.pdf
    • http://selebameb.marketing-digital.ru/uploads/2020/01/28/vitaxosad.pdf
    • http://kevokodaga.atlsnab.ru/uploads/2020/01/27/e39ce1c.pdf
    • http://repuuser.tech/uploads/2020/01/28/3d56ce20b.pdf
    • https://duvilukitarusa.weebly.com/uploads/1/3/0/4/130435524/d20c357dd3dbe.pdf
    • http://rizikufo.steuerschroeder.com/uploads/2020/01/28/feedc35a.pdf
    • https://tamitusobu.weebly.com/uploads/1/3/0/5/130550809/kenuwuvogofokob.pdf
    • https://pevexumixo.weebly.com/uploads/1/3/0/2/130291561/8e505f54.pdf
    • http://babuxe.vipiski-online6.icu/uploads/2020/01/28/jumidodanujobaj.pdf
    • https://rafilaluxonijew.weebly.com/uploads/1/3/0/4/130476150/130476150.html#sintomas+de+acidosis+tubular+renal+en+lactantes

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001386.bin
2ea74a4f421f0a2bcc37585bb3f302996f6de3d722d44afd115c76ba52d05f8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1386 9948 bytes

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