Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d98a558ea9e2d16…

MALICIOUS

PDF

32.9 KB Authoring application: Nitro PDF
MD5: 1962042c7869d4b1b4d4f1e288dc8159 SHA-1: 606e8de1b1ce878eb13838a94e6432680b157153 SHA-256: 5d98a558ea9e2d16bde103802ad282489119f9017828ebac3037d4cbb59a8c03
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to external PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content, as suggested by the 'PDF_SEO_LINK_FARM' heuristic and ClamAV detection. The ML classifier also strongly flagged this file as malicious. No scripts were extracted, but the sheer volume of external links suggests a coordinated effort to redirect users.

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://merakifarmacy.com/uploads/1/3/0/2/130288722/9027942.pdf
    • http://starbucksfs.net/uploads/1/3/0/7/130740045/1198618.pdf
    • http://psychotherapy121.net/uploads/1/3/0/8/130874246/9872e8c1270.pdf
    • http://paydaylendinginvestigation.com/uploads/1/3/0/4/130476878/ripilomugu.pdf
    • http://myrole.io/uploads/1/3/0/2/130274355/kidov.pdf
    • http://justactionnow.org/uploads/1/3/0/5/130546606/7378499.pdf
    • http://pivkofilm.com/uploads/1/3/0/3/130323115/jisogatixawuk_sijapadox.pdf
    • http://ujcdsgn.com/uploads/1/3/0/2/130288458/7268541.pdf
    • http://www.merchantshousefrome.co.uk/uploads/1/3/0/6/130604081/716255.pdf
    • http://realisedesign.com/uploads/1/3/0/2/130287553/68591a8b.pdf
    • http://luciestarr.net/uploads/1/3/0/7/130739366/gusulavoli.pdf
    • http://nutritionunique2u.com/uploads/1/3/0/7/130775683/5426657.pdf
    • http://nguyentandung.net/uploads/1/3/0/5/130589342/jitamax-bewajonoxuromu-nifer.pdf
    • http://cyclorise.co.uk/uploads/1/3/0/6/130604408/f23d275a700a15.pdf
    • http://webmail.justanothersunday.com/uploads/1/3/0/2/130289334/130289334.html#animal+and+plant+cells+worksheet+1.1+answer+key

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000274f.bin
efee239ee65d0e797c3b0c4886a66159935b6f292889ec1bd5fd07a646f59f47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x274F 7640 bytes

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