Malicious PDF — malware analysis report

Static analysis result for SHA-256 126ec68cc0009bc8…

MALICIOUS

PDF

42.5 KB Authoring application: Nitro PDF
MD5: bf38d9699b7044cc1f17c5e3577333b2 SHA-1: 98fff153e3b2ed6bf09f293a3562467bab9ba224 SHA-256: 126ec68cc0009bc8c6b4d6dadd911c9eb3fe2902df6e399cbee82fa935e87b16
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links to other PDF files, disguised as an English exercise. This technique is commonly used to distribute malware or phish for credentials by overwhelming the user with links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://horizontalwelldesign.com/uploads/1/3/0/7/130740438/rivekakuwixi-fegopigawibukan-wudepivelirube-gufexifube.pdf
    • http://oasischronicles.com/uploads/1/3/0/7/130740492/dafaxa-wazasuzugigar-rawofevakexoguj-nujos.pdf
    • http://styer-fitzgerald.net/uploads/1/3/0/4/130488734/1084847.pdf
    • http://travelerswine.com/uploads/1/3/0/4/130476208/pekaze_wulujet_sebilisarut.pdf
    • http://camphopeless.io/uploads/1/3/0/4/130491179/wibazarenebosefuzib.pdf
    • http://thecottonlickers.com/uploads/1/3/0/2/130289189/nevipubitamax.pdf
    • http://r3healthandfitness.com/uploads/1/3/0/5/130551621/7606828.pdf
    • http://h4sd.com/uploads/1/3/0/7/130775389/suxaw.pdf
    • http://plantationpest.net/uploads/1/3/0/3/130313038/3662327.pdf
    • http://poleatease.com/uploads/1/3/0/4/130476277/c83f9dc8fe.pdf
    • http://newbusinessdevelopment.net/uploads/1/3/0/6/130621123/2229154.pdf
    • http://revelationsmagazine.com/uploads/1/3/0/2/130288394/gexilazip_ragabe_molejobanedini_revumozofuju.pdf
    • http://runicpath.com/uploads/1/3/0/6/130603760/wesuvile.pdf
    • http://discoveryresourcesllc.net/uploads/1/3/0/4/130489386/kevetozeradolobovi.pdf
    • http://therebuildcovenant.org/uploads/1/3/0/3/130313158/gurogenal.pdf
    • http://beatsbytheharv.com/uploads/1/3/0/4/130435982/dawadawiz.pdf
    • http://genting-club.lucky1st.com/uploads/1/3/0/4/130476814/130476814.html#adverbs+of+frequency+exercises+perfect+english
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030b4.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30B4 16036 bytes
font_01_sfnt_off0000483e.bin
bdfaede9fc5e6a9cea439f3c037ddacc260a8ccd9f5258fbb1034d264aad5d97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x483E 8536 bytes

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