Malicious PDF — malware analysis report

Static analysis result for SHA-256 15de05351bc6babc…

MALICIOUS

PDF

28.7 KB Authoring application: pstoedit
MD5: e2351bb1dd99ace2602ca84d8110974a SHA-1: c6c2dbdac84f753aae950ae0dcb3a363d07a8096 SHA-256: 15de05351bc6babc07a39531ab9f9e941afc24199ec079e51e305ea61fb892cd
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique commonly used for SEO poisoning or to redirect users to malicious sites. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output strongly indicate malicious intent. The document body, though partially corrupted, contains text related to 'Cell organelle flashcards pdf' and includes the same URLs found in the embedded link farm, suggesting a lure to phishing or malware distribution sites.

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://imperiya.club/uploads/2020/01/29/5791979.pdf
    • http://dragonflyphotographyceramics.com/uploads/1/3/0/2/130291441/vizobagala.pdf
    • http://wuxufij.klubok-modno.ru/uploads/2020/01/28/7149256.pdf
    • http://ingeniumschools.net/uploads/1/3/0/4/130489066/6214674.pdf
    • http://greenlandretail.com/uploads/1/3/0/6/130639776/rurarokusu-mojasisesepetul-gokup-tofum.pdf
    • http://eldersemporium.com/uploads/1/3/0/2/130274301/vifab.pdf
    • http://monkonmolokai.com/uploads/1/3/0/4/130435556/mijoz.pdf
    • http://tcsonline.net/uploads/1/3/0/5/130588347/130588347.html#cell+organelle+flashcards+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010be.bin
9981f14e3ada081f66253eed678c4be226bec60aa63653838634b3a0b990f580		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE 7228 bytes

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