Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb394e12f5e6d274…

MALICIOUS

PDF

39.3 KB Authoring application: Karbon
MD5: a19fefb9022eb8e2dcba188efe04d147 SHA-1: b269898da0534ff1a033c36f7ca0933a2dc3d70a SHA-256: cb394e12f5e6d27423dc59818757201332ca2555a1f67c8f44da5231a842e29b
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links to external PDF files, a technique commonly used for SEO poisoning or to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted from this sample, but the extensive link farm suggests a delivery mechanism for further malicious content.

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://myketoquest.com/uploads/1/3/0/6/130604207/mojapigimowu.pdf
    • http://neotropics.net/uploads/1/3/0/8/130813642/5011770.pdf
    • http://toursofcalifornia.com/uploads/1/3/0/6/130639396/6398453.pdf
    • http://bookrenewers.com/uploads/1/3/0/5/130539820/2252812.pdf
    • http://beaconclean.com/uploads/1/3/0/5/130540281/44525f2a92358.pdf
    • http://michiesdogmeatsandtreats.com/uploads/1/3/0/5/130551687/a6993.pdf
    • http://massageinscottsdale.com/uploads/1/3/0/8/130874197/a38f2f7.pdf
    • http://nomoretoys.org/uploads/1/3/0/6/130639028/duturosetiza_genur.pdf
    • http://ymsm.agency/uploads/1/3/0/6/130621281/7472700.pdf
    • http://virginiablade.com/uploads/1/3/0/4/130493893/wewawuxet.pdf
    • http://agaveboutique.com/uploads/1/3/0/6/130639205/laverutusegifopigeb.pdf
    • http://necoraindustries.com/uploads/1/3/0/5/130588434/tifedip.pdf
    • http://dyeconcrete.com/uploads/1/3/0/8/130873848/81d809b.pdf
    • http://www.bravocall.com/uploads/1/3/0/2/130287547/2a9bff.pdf
    • http://superfastfingers.com/uploads/1/3/0/6/130605219/55d97a57aefd3.pdf
    • http://roadcraftdrivingschool.com/uploads/1/3/0/7/130776315/gakifulekimori_kitituwo.pdf
    • http://its1775again.com/uploads/1/3/0/5/130543685/3486559.pdf
    • http://whateverwelding.com/uploads/1/3/0/8/130873786/govanapomisetan.pdf
    • http://juicyscoopobsessed.com/uploads/1/3/0/5/130539714/130539714.html#oxford+collocations+dictionary+for+students+of+english+with+cd-rom+-+new+edition

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002472.bin
0fec520d00a0010bd10220e2b5e50a00918686724a73f084b7f7aab3ae37971f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2472 5520 bytes
font_01_sfnt_off0000394e.bin
7f9497bd28b82aa52641167cf1b35540f3c8db3d5b684fe81d924042883ce40e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x394E 9792 bytes

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