Malicious PDF — malware analysis report

Static analysis result for SHA-256 d333b087f01b20a9…

MALICIOUS

PDF

49.9 KB Authoring application: Smallpdf Desktop
MD5: e8a886d4212924b9f5b121ec89ab2a92 SHA-1: 1d08a830aaa2814732b2d08e27cdea485fb16fd8 SHA-256: d333b087f01b20a92706c9cc47485da6e74478317c03fc623db467bb2e447b36
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', pointing to various PDF files on different domains. This suggests a tactic to manipulate search engine results or to distribute additional malicious content through these links. 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.Dropper.Agent-9574144-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9574144-0
  • 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://cs-chloe.ru/uploads/2020/01/28/xofavigelafapotodifi.pdf
    • http://pojinuka.intersubcc.pw/uploads/2020/01/28/8448289.pdf
    • http://brian-amos.com/uploads/1/3/0/6/130605166/828176.pdf
    • http://topfinance.ru/uploads/2020/01/29/fatetadipukaxilos.pdf
    • http://nope.oldi-nix-dns.info/uploads/2020/01/29/8116204.pdf
    • http://msestate.co.jp/uploads/1/3/0/3/130323295/telawe.pdf
    • http://qkzkfk.weebly.com/uploads/1/3/0/4/130477252/doxodojunovu.pdf
    • http://mommyandbeeboutique.com/uploads/1/3/0/6/130621754/e185d3b7663f0.pdf
    • http://texassaddlefitter.com/uploads/1/3/0/5/130544110/rifezuzuwex_sikelugofave.pdf
    • http://sozol.business-idea.info/uploads/2020/01/28/rarokos_wadanupepek.pdf
    • http://treetopreptile.com/uploads/1/3/0/5/130546543/kinewusavesoma.pdf
    • http://idczakmotors.com/uploads/1/3/0/4/130476010/bovoboxata.pdf
    • https://ketinabejafi.weebly.com/uploads/1/3/0/5/130590467/mereme.pdf
    • http://maja.1504magaz.fun/uploads/2020/01/29/f31b8ce329750f9.pdf
    • http://onnellisuuskoulu.net/uploads/1/3/0/4/130476555/masowufadenorut_nefawisuribasum_kurijo_gaxijagufato.pdf
    • http://mossellsworth.com/uploads/1/3/0/2/130291783/lagiparixojobatun.pdf
    • http://nurtureministries.com/uploads/1/3/0/4/130489771/gometisu.pdf
    • http://davidmarquesibanez.com/uploads/1/3/0/5/130590051/130590051.html#ketone+formation+acid

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001535.bin
2b231a9ee8977e12d77cf74dffc968e0d900dc8a3228735d6ec431527134f958		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1535 8800 bytes
font_01_sfnt_off0000864d.bin
2169b69c211dc2c67f0fc0e4108f07096705c7e53e99067ba31e7f7cc921ab30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x864D 3188 bytes

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