Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c95a81ab755d6b2…

MALICIOUS

PDF

48.0 KB Authoring application: OpenOffice.org
MD5: 0b8468360bc385100f5e928486882590 SHA-1: e1b99e16ddb6f544a2b72fccdb5828abe8d52d9b SHA-256: 2c95a81ab755d6b237ecd6345fe0cf879e7955e6c97f260853b6b972779ba554
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files, a technique often used for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body is heavily obfuscated and does not provide clear user-facing text, but the heuristic 'PDF_SEO_LINK_FARM' directly identifies the attack pattern of linking to numerous external PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nylarose.co/uploads/1/3/0/4/130488955/2626436.pdf
    • http://gcheavenlycleaning.services/uploads/1/3/0/4/130483863/mizale.pdf
    • http://yopcrealab.org/uploads/1/3/0/5/130550981/3895747.pdf
    • http://protopcbassembly.com/uploads/1/3/0/7/130739949/vivulakaw.pdf
    • http://rajaampatdivers.com/uploads/1/3/0/8/130813651/b7f47.pdf
    • http://carbonsoccer.com/uploads/1/3/0/9/130969308/6970803.pdf
    • http://chasinghappy3.com/uploads/1/3/0/6/130620537/wipag.pdf
    • http://northwestpetroleum.com/uploads/1/3/0/5/130551015/sexelit.pdf
    • http://daytonconcretecontractors.com/uploads/1/3/0/4/130483191/folidubexip.pdf
    • http://coachypnotherapie.com/uploads/1/3/0/7/130739098/8692345.pdf
    • http://www.novelcritques.com/uploads/1/3/0/4/130476347/lanaleto.pdf
    • http://tahoesierracleanair.com/uploads/1/3/0/7/130776688/1a1eeb6ba0f66.pdf
    • http://ethanseelig.com/uploads/1/3/0/8/130874642/jepudejine.pdf
    • http://competetennismerchandise.co.uk/uploads/1/3/0/6/130639537/d317c50149df795.pdf
    • http://twocivilwars.com/uploads/1/3/0/5/130590154/batulubebilapabeze.pdf
    • http://flyingsquadpromotion.com/uploads/1/3/0/6/130621581/0e92cc0aa96f2.pdf
    • http://gilhaus.eu/uploads/1/3/0/6/130621754/5923807.pdf
    • http://kindspa.com/uploads/1/3/0/4/130489143/130489143.html#arithmetic+sequence+formula+sum

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003ca7.bin
49a5edf70c963fba076b4d0c0df0de645d978f417d59196646ccac95c21b903b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3CA7 3152 bytes
font_01_sfnt_off000046d0.bin
5756f33ea8b8d278b9e6f6642e83245814f2678611343b814fec1f2c03683d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46D0 16112 bytes
font_02_sfnt_off00005eb4.bin
b2fbcb2a75c6246c39d423990f7431460921cc99285fc7774f72198b61b9f7ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB4 8368 bytes

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