Malicious PDF — malware analysis report

Static analysis result for SHA-256 934ff3ad8d59913a…

MALICIOUS

PDF

38.9 KB Authoring application: Solid Converter PDF
MD5: f42b4197ddd139ac7097955851dce1b6 SHA-1: 0410319744cd74de8e7f3aabad39cf9c8bf7e5fa SHA-256: 934ff3ad8d59913afe4c1d67af7c80cd64178900303fd8c94d5f6a5e8cb47e00
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, contains references to 'Accenture sap hr interview questions', likely a lure to disguise the malicious nature of the links. The primary attack pattern involves redirecting users to a vast array of external PDF files hosted on unrelated domains.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://gandrkitchenhardware.com/uploads/1/3/0/6/130604764/jiterunipexugunidoma.pdf
    • http://sidemountainspecialtyfoods.com/uploads/1/3/0/6/130622091/damiwobu_zokis_mabipixaborare_puwoza.pdf
    • http://nannytherapy.net/uploads/1/3/0/4/130483147/e8599f9a.pdf
    • http://amarok.nl/uploads/1/3/0/6/130604580/pelom_kijijukubakavoj_satebedetuso_wadosas.pdf
    • http://assortedartistries.net/uploads/1/3/0/6/130639787/vetekevoloroba_ravog_zufexetabepazig_juzefip.pdf
    • http://spiritjooga.com/uploads/1/3/0/6/130639659/kobonelenuku_meweguruj_raxogifijogiwuv.pdf
    • http://silenusentertainment.com/uploads/1/3/0/5/130541624/6f1d05306f04f9.pdf
    • http://nicoleedwardslimited.org/uploads/1/3/0/6/130604618/6602608.pdf
    • http://pofooduck.com/uploads/1/3/0/6/130621803/gamusapabumugegaxe.pdf
    • http://masigabub.muzonik.ru/uploads/2020/01/28/fe6046314d5.pdf
    • http://ohmysolehelena.com/uploads/1/3/0/5/130544591/nefefogirewopof_tiwatasug_kiwotidizo_nabewazaforu.pdf
    • http://newperspectivemedical.com/uploads/1/3/0/3/130324119/130324119.html#accenture+sap+hr+interview+questions

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001366.bin
eea7fd7413b37deca0b5f50bd92150768e7439df1998d8c09c3c310fc3aa581a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1366 7908 bytes

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