Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33dc321a07f373f…

MALICIOUS

PDF

40.5 KB Authoring application: SWFTools
MD5: 187b76558b396b22b2356ce00d1182dd SHA-1: 80fa92b9e868fbaddd11d9620723f58451e47646 SHA-256: b33dc321a07f373f29b0557c0b59dc380ecc323db508495e1d881892cc7f7b5e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. This suggests a phishing or malware distribution campaign leveraging SEO techniques. The ClamAV detection and ML classifier further support the malicious nature of the file. No scripts were extracted from this sample.

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://gemut.help-vk.ru/uploads/2020/01/29/jofojarerajuzakuxu.pdf
    • http://willowdisplays.com/uploads/1/3/0/6/130621574/1374076.pdf
    • http://gasu.ach-dziewczyny.online/uploads/2020/01/29/65fc759a7baf0.pdf
    • http://banuzelib.mummys-gold.ru/uploads/2020/01/28/famoxifeza.pdf
    • http://soulsinfriendship.org/uploads/1/3/0/6/130621502/juputozep_jogumuwazoki_panurizipuwim_dexebozud.pdf
    • http://cathlinchiang.com/uploads/1/3/0/3/130313376/b0bfa5b0.pdf
    • http://ingridholmtranslations.com/uploads/1/3/0/4/130476427/gefeguwopovate-jirutisufizo-bedelogeziger.pdf
    • http://war.party.su/uploads/2020/01/28/3847344.pdf
    • http://berkshireheros.org/uploads/1/3/0/6/130620431/feselaravumirotipa.pdf
    • http://beyondhillco.com/uploads/1/3/0/6/130620981/130620981.html#describe+five+qualitative+characteristics+of+accounting+information

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001275.bin
c0bd563b453ed8b62eb4c30363aef153ecf5edc46902ad4bda60d0054a74bc7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1275 7576 bytes

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