Malicious PDF — malware analysis report

Static analysis result for SHA-256 22724ee448bf41f1…

MALICIOUS

PDF

48.1 KB Created: 2020-04-12 22:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9d3b19e7e5e4d66e60ace3070ede9b88 SHA-1: a060a6be13936d48a8cb896176d29b5d5f6e06ee SHA-256: 22724ee448bf41f19e95d0601e6643c60393e5eebed67e2cfa1b5618a4ed74a9
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, a technique commonly used for SEO link farming and malicious redirection. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this pattern, indicating a likely attempt to distribute malicious content or traffic. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample, and the document body is heavily obfuscated, making it difficult to determine the exact nature of the final payload.

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://earthspiritpress.net/uploads/1/3/0/3/130323506/130323506.html#rasgueos+de+guitarra+folklore
    • http://hwkmth.com/uploads/1/3/0/6/130604518/botojisir-mabadala-nubekuf.pdf
    • http://danishamericanheritagesociety.org/uploads/1/3/0/6/130621649/4e10e3e.pdf
    • http://andylunga.com/uploads/1/3/1/0/131070751/xidiboviwufipava.pdf
    • http://medusacustoms.com/uploads/1/3/0/2/130289421/rulapatefir.pdf
    • http://cshaalumni.org/uploads/1/3/0/8/130814960/e0851bd5.pdf
    • http://trogaguides.com/uploads/1/3/0/8/130873783/1539550.pdf
    • http://americantraditioncarpentry.com/uploads/1/3/0/6/130621383/7111853.pdf
    • http://adamholtindustries.com/uploads/1/3/0/6/130640079/1136883.pdf
    • http://onthebuttonflowers.com/uploads/1/3/0/7/130740138/wukixelefez.pdf
    • http://vitalsparktraining.com/uploads/1/3/1/3/131383613/jidakurawadod-pufojewitaveg.pdf
    • http://simpledeskonline.com/uploads/1/3/0/4/130483949/3530131.pdf
    • http://affinityhomeagent.com/uploads/1/3/1/0/131070307/tegatikufinexutu.pdf
    • http://wvk9searchandrescue.com/uploads/1/3/1/4/131453536/bivadujuvuk.pdf
    • http://drkelseykeltgen.com/uploads/1/3/1/3/131384306/e809c7f.pdf
    • http://vitalsparktraining.com/uploads/1/3/1/3/131383613/jidakurawadod-pufoj
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000860f.bin
57b6829ea756b7fa7e925a5c91d0db3f82057b02a3350a33c106788fce8c6239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x860F 9652 bytes
font_01_sfnt_off0000a905.bin
83d89f79375f7f339e88070a8779324ce221c94923bff415e388e162fbc46cfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA905 2604 bytes

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