Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a427d316e8eab08…

MALICIOUS

PDF

34.6 KB Authoring application: Smallpdf Desktop
MD5: ec4fb95b222636cc270662b755c05610 SHA-1: 52f015848aa29538cb10475d68d6fc3deb7e4d75 SHA-256: 7a427d316e8eab08d0e6a2093cf102ecd5ba9224c9daea6924d9a869d2947b8d
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, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. This behavior is often associated with SEO spam or as a method to distribute malicious content indirectly. The ClamAV detection as Pdf.Phishing.TtraffRobotInstall-7605656-0 further supports a malicious intent, likely related to phishing or traffic redirection.

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://militarywivessurvivalguide.com/uploads/1/3/0/6/130621906/cc1e5ef65.pdf
    • http://migutakoju.prorealgame.ru/uploads/2020/01/27/5348619.pdf
    • http://4us2wire.com/uploads/1/3/0/5/130588508/tolerikupapabu_sonojagi_xesuk_rojilekodox.pdf
    • http://septik-kos.ru/uploads/2020/01/28/leboda.pdf
    • http://abbiesesthetics.weebly.com/uploads/1/3/0/5/130551050/xodojeferi-momawufazopizo.pdf
    • http://newlifecpr.net/uploads/1/3/0/4/130483459/desakilejofil.pdf
    • http://hello-baby-toys.com/uploads/1/3/0/6/130604031/130604031.html#aluminized+steel+sheet+suppliers

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001128.bin
f14ddaaa17e380c79ad38c9f8c203c6506bc285b6cd922890100286bbce348e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1128 8436 bytes

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