Malicious PDF — malware analysis report

Static analysis result for SHA-256 84633f81ae362b99…

MALICIOUS

PDF

32.5 KB Authoring application: SWFTools
MD5: 1cc59d36f034d131d52228b24668ecfa SHA-1: 1bccab91526b3a01177982302de78553e137675f SHA-256: 84633f81ae362b9977e798203c6fb48225164bf737f37ec0a9d68f52cea75916
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to other PDF files, a technique often used for SEO spam or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests a link farm designed to redirect users.

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://currentstates.com/uploads/1/3/0/6/130603704/2361640.pdf
    • http://nlccpsw.org/uploads/1/3/0/2/130288629/8035144.pdf
    • http://friedcheesesandwich.com/uploads/1/3/0/7/130776249/26aac11a.pdf
    • http://northwestpolebuildings.com/uploads/1/3/0/6/130604153/9815571.pdf
    • http://curetania.org/uploads/1/3/0/6/130639699/a8032831.pdf
    • http://clusterfunctor.com/uploads/1/3/0/6/130620694/5985139.pdf
    • http://www.middlemurch.co.nz/uploads/1/3/0/7/130775683/e20287db.pdf
    • http://www.structureskenya.com/uploads/1/3/0/6/130603946/7dc42.pdf
    • http://dpaulart.com/uploads/1/3/0/8/130814534/ed2648.pdf
    • http://leoeandhyde.com/uploads/1/3/0/2/130270792/8f901d3.pdf
    • http://a1012971xstreamtravel.xsideas.com/uploads/1/3/0/3/130323984/130323984.html#acca+f2+cbe+past+papers

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000029f2.bin
ab2471336263d73ba83378edab37b454e5d4f7272260960649c4e6c71a39e31d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x29F2 7636 bytes

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