Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c84d82fc1117ff…

MALICIOUS

PDF

37.7 KB Authoring application: PDFedit
MD5: a915b725bc7a90af0ef40174f7737119 SHA-1: 54b937601bfbad362d2cc07a98637436909f9342 SHA-256: 42c84d82fc1117ff174f2d63bb74e7fced1e2e1bbd0009c184a0c562d2a59f02
150 Risk Score

Malware Insights

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

The file is a PDF document that contains a large number of embedded links to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO poisoning attack, designed to drive traffic to potentially malicious content. The ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier's high confidence score further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://kswinehk.com/uploads/1/3/0/7/130739542/wujamowidovude_ditofalakeles.pdf
    • http://dobikeplan.com/uploads/1/3/0/4/130435596/navibode.pdf
    • http://my-bizco.com/uploads/1/3/0/6/130621325/latul-vuvijirozetap-tibabotaregev.pdf
    • http://cbdsnacks.me/uploads/1/3/0/5/130539553/942a4.pdf
    • http://nevermoreacrespetrescueinc.com/uploads/1/3/0/5/130544136/namafabo.pdf
    • http://napacounty-rc.com/uploads/1/3/0/3/130379814/tukefobekif.pdf
    • http://mobileprompter.net/uploads/1/3/0/4/130478347/zejaseza-zewojum-tabidurijurako.pdf
    • http://realestateforsaleinmaine.net/uploads/1/3/0/5/130545365/7354977.pdf
    • http://michellegoodman.net/uploads/1/3/0/2/130270938/42900ff5a0d.pdf
    • http://absystemsllcscam.com/uploads/1/3/0/7/130739076/130739076.html#maslow+theory+of+motivation+pdf+in+hindi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000120b.bin
55861d10c1cba6f595420e6b9b771c84ffd0a58df077f3643d38f63e18cb3920		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120B 7716 bytes
font_01_sfnt_off00004592.bin
2683456f2435bb09c0383b4f7130db3426020aa33a0f7eeaaf11ba7365f0ffe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4592 10544 bytes

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