Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c01b67c1c27da9…

MALICIOUS

PDF

37.0 KB Created: 2020-05-25 21:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd01a1b8147aa32d1bfc9bd843eacc55 SHA-1: fbf785569de662a9be7b7799230076db5182f3c2 SHA-256: a9c01b67c1c27da907850ababe91d99b93728638c35d0c7f6e53baf96237e5d5
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to the URLs, suggesting a deliberate attempt to create a link farm. The primary purpose appears to be SEO manipulation or potentially distributing further malicious content through the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://peakathleticsystems.com/uploads/1/3/0/6/130604196/130604196.html#gerald+and+piggie+coloring+pages
    • http://1stchoicecontractingllc.com/uploads/1/3/1/6/131608016/roxuzugep.pdf
    • http://jennytung.com/uploads/1/3/0/4/130490808/buvit.pdf
    • http://andreasalgava.com/uploads/1/3/0/8/130873860/9365503.pdf
    • http://hinesvilletoys.com/uploads/1/3/1/6/131607062/464923a3e16ef.pdf
    • http://tlchconstructioninc.net/uploads/1/3/0/8/130814285/pepemupowunibawema.pdf
    • http://aletaslater.com/uploads/1/3/0/5/130588718/5993d68e3.pdf
    • http://theessentialeshelman.com/uploads/1/3/1/4/131410597/jozozedonedomixasi.pdf
    • http://hremschol.com/uploads/1/3/0/4/130476481/1007304.pdf
    • http://examplesites.biz/uploads/1/3/0/3/130323097/tuxamuxugozebumawupi.pdf
    • http://sugarfischyteam.com/uploads/1/3/0/7/130738912/sajij.pdf
    • http://maracramerlpc.com/uploads/1/3/0/6/130621019/xakip.pdf
    • http://empoweruvr.com/uploads/1/3/0/6/130621196/livadidobobamixi.pdf
    • http://tarabayliss.com/uploads/1/3/0/2/130289662/ba81a28f1944982.pdf
    • 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_off000050aa.bin
9eaebef38a3921d1b161944e4274f80f26be94d0d9ec9f85bf3206c826728827		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50AA 10480 bytes
font_01_sfnt_off00007348.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7348 16204 bytes

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