Malicious PDF — malware analysis report

Static analysis result for SHA-256 21af8ba2b8a19377…

MALICIOUS

PDF

75.4 KB Authoring application: Pdftk
MD5: 6d39993082e051d5f3b4d8d93df6034c SHA-1: ab2d03d82d2262f2881cf0ec358c6de209b43a35 SHA-256: 21af8ba2b8a193778078d00597d053d1976c084a46a946c847c6f83234cbf4c1
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as a link farm containing numerous external links to other PDF files. This behavior is indicative of SEO manipulation or a distribution mechanism for further malicious content. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' further supports a malicious classification. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of specific user-facing lures.

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://ashleyrbryant.com/uploads/1/3/0/4/130478433/kopasegefikug_gilobokepi_jopazanovovanap.pdf
    • http://cerritosnotarypublic.com/uploads/1/3/0/5/130551635/jawir-mepikamud-duxigoxosubobi-xosusuwusaduzo.pdf
    • http://morethanfood.net/uploads/1/3/0/6/130621814/5b2a9e99.pdf
    • http://michaudwellness.com/uploads/1/3/0/2/130291350/130291350.html#%D8%B9%D8%B1%D8%B6+%D9%85%D8%A8%D8%A7%D8%B4%D8%B1+%28%D9%83%D8%A7%D9%85+%D9%84%D9%8A%29

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000c2e9.bin
b0a6373c43b079c4613c685c2cf428d5cc4aaaf1dccd774bc13788804e705788		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC2E9 33220 bytes
font_00_sfnt_off00001171.bin
74ab193ccf1332d5e14bdba4a5622dbf67c8e49111403f52f759e053e58fdc25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1171 7524 bytes

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