Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c136e4e64c941bf…

MALICIOUS

PDF

33.6 KB Authoring application: Solid Converter PDF
MD5: 9dfc179751b5737c7f70ea6a9adaba2e SHA-1: a71fda4755a35dc9cbec9b68319722ee2247bbda SHA-256: 7c136e4e64c941bfb5d659de7a0902ee53234fc187bb36529c0c63a51769f90e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded URLs pointing to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for malicious content, as suggested by the 'PDF_SEO_LINK_FARM' heuristic and ClamAV detection. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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://swiftcustommetal.com/uploads/1/3/0/6/130621108/8992116.pdf
    • http://falkenbergadmissionsadvising.com/uploads/1/3/0/7/130775456/6653377.pdf
    • http://foto-research.com/uploads/1/3/0/3/130379178/6d7257b2e2553.pdf
    • http://sidewalklegal.com/uploads/1/3/0/2/130270936/tigeladijax.pdf
    • http://betterbloodwork.com/uploads/1/3/0/2/130271116/valovesezebep.pdf
    • http://monikanalepa.weebly.com/uploads/1/3/0/6/130640095/7ed83448c94a.pdf
    • http://difficultrunponyclub.org/uploads/1/3/0/5/130588412/7606576.pdf
    • http://thatsdoctortoyou.com/uploads/1/3/0/8/130873769/56225.pdf
    • http://brooklyneventstudios.com/uploads/1/3/0/5/130539881/43203a1eb7.pdf
    • http://budapestartsociety.com/uploads/1/3/0/2/130274305/2911257.pdf
    • http://adoredaussies.com/uploads/1/3/0/6/130605028/gikubugirawu_niwubava_bujip.pdf
    • http://nickgiamarino.com/uploads/1/3/0/2/130287407/kadijasinisixut.pdf
    • http://misssupremepurityqueen.com/uploads/1/3/0/6/130603913/130603913.html#cavernous+sinus+thrombosis+ct+radiology
    • http://misssupremepurityqueen.com/upl

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012e3.bin
33b3100e1f8067cffbd58b1ea807319dae3232e5e11f35f19386d0023281427c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3 7412 bytes

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