Malicious PDF — malware analysis report

Static analysis result for SHA-256 181e2bb6649e2de6…

MALICIOUS

PDF

35.5 KB Authoring application: Nitro PDF
MD5: f8667dbc4dcf016d46bf13245adf1faf SHA-1: f8f6ca5ae4db2b008965143dd0b3247aef2515a1 SHA-256: 181e2bb6649e2de608959c73e9bb53758e68f6459ad88238275aad5fb310cb1d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links to external PDF files hosted on various domains, indicative of a link farm or a distribution mechanism for further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure itself is the attack vector.

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://coloquioespanacee1979-2019.com/uploads/1/3/0/5/130547207/b29fa363ad8.pdf
    • http://2kgcasting.com/uploads/1/3/0/6/130605255/8033515.pdf
    • http://meminpinguin.com/uploads/1/3/0/7/130739373/mezowutebujikow.pdf
    • http://miskatonic-journal.ca/uploads/1/3/0/6/130605078/runuv.pdf
    • http://natashasfantastic5dollarbling.com/uploads/1/3/0/8/130814630/fuvuruj.pdf
    • http://www.servpro-philippines.com/uploads/1/3/0/6/130622091/bunekoxe.pdf
    • http://routerbitsets.com/uploads/1/3/0/7/130776304/lubidepuvilade_jafifoju.pdf
    • http://buzzyporter.com/uploads/1/3/0/8/130813663/2b1424.pdf
    • http://brownforillinois.com/uploads/1/3/0/4/130483232/vilovejaragoz.pdf
    • http://therealburgerco.com/uploads/1/3/0/3/130323585/03b8b25485.pdf
    • http://pinkfeatherboutique.com/uploads/1/3/0/7/130776680/vumazutezefigexi.pdf
    • http://www.planpartproduct.com/uploads/1/3/0/4/130435884/dd2735036769.pdf
    • http://rvsolarpanelpros.com/uploads/1/3/0/5/130551684/fizidurunigunot-vuvuvutirirapi-naxesurikuxesun.pdf
    • http://woodridgemusicclub.com/uploads/1/3/0/3/130379381/3127110.pdf
    • http://trnkee.com/uploads/1/3/0/9/130969080/130969080.html#convert+pdf+scanned+image+to+word+online

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ec6.bin
5c5fd37015cc043ba310723249b5592ca7e85ca2ee2027091bc37e7decf63b23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC6 8908 bytes

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