Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39730b7a28dd6d8…

MALICIOUS

PDF

79.8 KB Authoring application: Nitro PDF
MD5: e96d14ff96582174b7560df3658921e8 SHA-1: 10a8539542d82fb22148e1d487b66e4ee6342649 SHA-256: b39730b7a28dd6d8221d20bebba639f52692c6aa9ce8a9eab25b943cccc06cd0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of embedded links to external PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, aligning with the PDF_SEO_LINK_FARM heuristic.

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://deadbeatbuddy.com/uploads/1/3/0/6/130639026/fonikinamupanal.pdf
    • http://jimzallar.com/uploads/1/3/0/8/130813931/5799453.pdf
    • http://alyssaclements.com/uploads/1/3/0/4/130490585/nawopemakane-palaremetu-doruka.pdf
    • http://orderbazaar.com/uploads/1/3/0/7/130776008/1788637.pdf
    • http://writingcoachpousd.com/uploads/1/3/0/3/130323469/1855958.pdf
    • http://seaspaorganics.com/uploads/1/3/0/4/130488442/dokif-mizegepumafib-gikosatavunid-lelozo.pdf
    • http://mykpilgrim.com/uploads/1/3/0/3/130313309/pumibuwotamefilup.pdf
    • http://soundanddoctrine.com/uploads/1/3/0/4/130483260/sopikavabowi_nomedelifagaxo_gexoxok.pdf
    • http://theoilymixer.com/uploads/1/3/0/5/130539241/jenefiw.pdf
    • http://votebyweb.com/uploads/1/3/0/2/130271004/e9443a01cc10.pdf
    • http://wrkj.org/uploads/1/3/0/7/130739827/pazinusezil_nuvomixuvaza_foxesu.pdf
    • http://www.riverstonepsychologicalservices.com/uploads/1/3/0/2/130288864/f415b3361443.pdf
    • http://ezparkwalk.com/uploads/1/3/0/6/130620437/setodativigekofoj.pdf
    • http://gilsonwerneck.com/uploads/1/3/0/4/130488816/debabijof.pdf
    • http://netcommnc.com/uploads/1/3/0/7/130775215/4612341.pdf
    • http://amazingcloaker.com/uploads/1/3/0/8/130874329/noluji.pdf
    • http://ivflush.com/uploads/1/3/0/3/130379061/3a502e19a9cd.pdf
    • http://67xq3.salon225.com/uploads/1/3/0/4/130483320/130483320.html#enterobacter+aerogenes+osteomyelitis

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e3b.bin
4916b821a7ebdfb5d67f057be42ac7df78cd027734836ee89bb1b182bed48b98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E3B 9320 bytes

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