Malicious PDF — malware analysis report

Static analysis result for SHA-256 a199a2ede6d61113…

MALICIOUS

PDF

33.3 KB Authoring application: LibreOffice
MD5: 99d80ff43975e1d4150cd23c6e4188c4 SHA-1: 0b317ff3b255aa2805957679b2c8d42e4d04e31a SHA-256: a199a2ede6d61113db2c598b7a46fc6ae78ea93a6b3a641d7ea9d544a818f6b3
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO poisoning or to distribute further malicious content. The document body, though partially corrupted, indicates a lure related to a 'Big five personality test questionnaire'. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://libertyrudo.com/uploads/1/3/0/5/130588942/wimoz.pdf
    • http://nitesukogi.fotostr.ru/uploads/2020/01/28/kezaf-vineluvizeg.pdf
    • http://moneymentorph.com/uploads/1/3/0/6/130621481/154f8035e.pdf
    • http://michelle-leach.com/uploads/1/3/0/5/130589140/gevuxokezer.pdf
    • http://arbucklelakelodge.com/uploads/1/3/0/6/130604083/kuwepajijobebutenizi.pdf
    • http://mydietea.com/uploads/1/3/0/5/130589338/joruvuporonagibon.pdf
    • http://srilankanprivatedriver.com/uploads/1/3/0/6/130620736/ramuxiwizilu_zaziwofi.pdf
    • http://greecejapan.net/uploads/1/3/0/5/130589218/kanemajapusejug.pdf
    • http://us.momotombochocolatefactory.com/uploads/1/3/0/6/130621362/130621362.html#big+five+personality+test+questionnaire+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001344.bin
bd55839a120a515dd7f6ffda0e1f31ae9de885c9940efe45be0c8eae4d4f7083		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1344 7884 bytes

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