Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b3ec2689ee773b…

MALICIOUS

PDF

30.7 KB Authoring application: LibreOffice
MD5: bb5390c0cf06d4275f254dadf833d9a8 SHA-1: fde573e98ce70f2132335a17292c887756920242 SHA-256: a2b3ec2689ee773b88710c404e18e20243b609bcbdad99a735c00d71968b8284
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links to other 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 indicated maliciousness. 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://jamesbrown4judge.com/uploads/1/3/0/3/130323631/7363621.pdf
    • http://doturuv.market-voice.ru/uploads/2020/01/28/majufinunaxolasedej.pdf
    • http://alwoc.org/uploads/1/3/0/6/130604141/62bb777.pdf
    • http://megud.walkwork.info/uploads/2020/01/28/dosogegujal.pdf
    • http://andres-historical.com/uploads/1/3/0/6/130604026/xebunima_tawularagikin_diwameru_lezezisaka.pdf
    • http://guribin.dodora.ru/uploads/2020/01/28/30f266.pdf
    • http://mabojol.flowers38.ru/uploads/2020/01/28/torasoki-zitoxixi-japuneje-serezimutib.pdf
    • https://munifufe.weebly.com/uploads/1/3/0/6/130604026/nodudifi.pdf
    • http://davediamond.info/uploads/1/3/0/6/130620942/89e8a22dc.pdf
    • http://kelleycarney.com/uploads/1/3/0/7/130740080/36e17a000c3d0.pdf
    • http://bodaderu.wisdom-olga.ru/uploads/2020/01/28/1856637.pdf
    • http://seizediem.com/uploads/1/3/0/3/130324416/130324416.html#linkin+park+in+the+end+remix+mp3+320kbps+free+download

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000014ab.bin
a364af2735104f45e68afcd23df6c5471cd5e11311ae6b6207e7e8a6dd4993ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB 8320 bytes

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