Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa99cdf0124826b…

MALICIOUS

PDF

45.5 KB Authoring application: PDF Studio
MD5: c5bcce854a35e27efebd6449b64e1556 SHA-1: 648c0d3000fcd4f0535f7a33f1ff2046f9b1a1eb SHA-256: cfa99cdf0124826b76e66f0ab61a813b04483d93517e16a04c7a95ee1f59f80a
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also strongly suggest maliciousness. The embedded URLs point to various domains, each hosting a PDF file with a numeric or generic slug in its path, consistent with SEO spam or phishing campaigns designed to drive traffic to malicious content.

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://neworleans-homeinspections.com/uploads/1/3/0/6/130603961/372797d.pdf
    • http://ritasoto.com/uploads/1/3/0/8/130814052/3630811.pdf
    • http://shareyourcgdstory.com/uploads/1/3/0/7/130775679/xuvutimani.pdf
    • http://norighttokill.org/uploads/1/3/0/8/130814591/lowomexibuf-vemidol-tanufurorizi.pdf
    • http://travel-merit.com/uploads/1/3/0/2/130287936/5716842.pdf
    • http://hostmaster.rpenalaw.com/uploads/1/3/0/8/130874634/lexuji_soloparugedad_zamubeveru.pdf
    • http://www.chariotskzn.co.za/uploads/1/3/0/4/130436483/zexori_xujubofiwatevaw_fitubifetazugok_zonovinenetom.pdf
    • http://buugis.com/uploads/1/3/0/2/130289641/82772e6.pdf
    • http://catjewellery.net/uploads/1/3/0/5/130542734/vadafemi_boxiwumerula_bujupobe_lorepikumikuxuz.pdf
    • http://newtribes.org/uploads/1/3/0/7/130739301/xulejezalu.pdf
    • http://aimeelora.com/uploads/1/3/0/3/130313718/mipasefo-vufal-makuwujaropes.pdf
    • http://martinlalande.ca/uploads/1/3/0/7/130776801/5381740.pdf
    • http://bearsversusbabiesgame.org/uploads/1/3/0/6/130604860/wajewoj.pdf
    • http://adsl-63-204-18-9.benefitplans.org/uploads/1/3/0/6/130621950/130621950.html#reading+comprehension+exercises+basic+level+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000103f.bin
b8f7492b56aa7148ebc8876242e0dcb788ed65f63256bae1ff8407b4f1ce8610		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103F 7836 bytes

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