Malicious PDF — malware analysis report

Static analysis result for SHA-256 884d39e4d43b94c9…

MALICIOUS

PDF

42.4 KB Authoring application: pstoedit
MD5: f215cc2e4bb3b8e60e9bfa0aef6d6630 SHA-1: cf1a8e7a86c80792a0db2499cbee3748a30277e4 SHA-256: 884d39e4d43b94c93595091f361df8c248c200ab182fb31960b4dfd081edf0ff
150 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common tactic for phishing and malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though partially obfuscated, suggests a lure related to a job application, directing users to download other PDF files from various domains.

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 https://xewiwexofunu.weebly.com/uploads/1/3/0/4/130483198/a46ad9a470ddc07.pdf
    • http://3axisphotography.com/uploads/1/3/0/5/130539797/xusuloferuwale-kobig.pdf
    • http://tatianasy.com/uploads/1/3/0/4/130488946/gawisunutiwipi.pdf
    • http://ashonfood.com/uploads/1/3/0/4/130436080/rukusum_bekonizigaku_tujefupitan_jemawazerutavi.pdf
    • http://northwestfineartstudio.com/uploads/1/3/0/6/130605433/bofolujabe.pdf
    • http://nazorali.dkto.pro/uploads/2020/01/28/3f460.pdf
    • http://beyondhillco.com/uploads/1/3/0/4/130488410/130488410.html#cover+letter+for+applying+teaching+job

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000115e.bin
a861270ef00654f1aabf6cd6d124bbfe34eff3e651eab77f06944e67fdf6c3a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E 8436 bytes

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