Malicious PDF — malware analysis report

Static analysis result for SHA-256 316c9bbad9273626…

MALICIOUS

PDF

68.1 KB Authoring application: GIMP
MD5: a5118cade53cbbe20e42d0b8c4e1251b SHA-1: 13f56edd62ec0ed61d3128eb714d8afdda0486d7 SHA-256: 316c9bbad9273626edd5d0e5f8daa86d09eb161eb4d63890ca1d0d3c50389f00
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, identified as a link farm. This is strongly indicative of malicious intent, likely for SEO poisoning or to distribute further malware. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, and the document body is heavily obfuscated, but the sheer volume and nature of the external links are the primary indicators.

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://alphonseasylum.com/uploads/1/3/0/6/130620371/5527857.pdf
    • http://bigdatahq.com/uploads/1/3/0/6/130603673/fabuzo.pdf
    • http://krowncustomcues.com/uploads/1/3/0/6/130620642/1554477.pdf
    • http://www.apple-journey.org/uploads/1/3/0/5/130588299/ccd251db66a.pdf
    • http://canadianweddingblog.com/uploads/1/3/0/2/130289296/muziwezon.pdf
    • http://ntwstudioart.com/uploads/1/3/0/3/130323127/jafoxipoguj.pdf
    • http://recruiting2care.com/uploads/1/3/0/2/130289652/xizewukigekemevezez.pdf
    • http://www.goodlifeelixir.com/uploads/1/3/0/6/130620797/8c726.pdf
    • http://dragonboxboston.com/uploads/1/3/0/6/130620295/tatowitak_sirewavubi_salanagafo.pdf
    • http://nammoi.net/uploads/1/3/0/2/130272575/c4af5.pdf
    • http://technology-safari.com/uploads/1/3/0/2/130272571/tukepipopelesopokak.pdf
    • http://shanefaddis.com/uploads/1/3/0/4/130436007/sewofusur.pdf
    • http://nwm7.club/uploads/1/3/0/5/130542922/zemisivonudor.pdf
    • http://sepiat.one/uploads/1/3/0/4/130476981/8912005.pdf
    • http://mommylovesandrew.com/uploads/1/3/0/6/130621366/43f21359da1f32.pdf
    • http://themodcube.com/uploads/1/3/0/5/130542922/f8b10b036b82d62.pdf
    • http://simplygreenhomeservices.com/uploads/1/3/0/6/130605291/zuxazasaguwuz.pdf
    • http://www.ambrancedesigns.com/uploads/1/3/0/5/130588543/ec02a27120.pdf
    • http://createoregon.com/uploads/1/3/0/6/130620998/5109375.pdf
    • http://koolcompanies.com/uploads/1/3/0/4/130436261/veronirurixav.pdf
    • http://undertheroaktravel.voyagerwebsites.com/uploads/1/3/0/6/130639532/130639532.html#phases+of+action+potential+of+cardiac+muscle

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000180c.bin
29034dad4cc5dc00ea7dad0f4575cb88a8f9260b1989b8114f3b5495ca8aef0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x180C 9372 bytes
font_01_sfnt_off0000ce9c.bin
bff1374cd5d68ec7fef1c56a6dcb4130062e8e687cbddba7a1f3180d6a99bb89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9C 3284 bytes

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