Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd99139c11cdae2…

MALICIOUS

PDF

32.0 KB Created: 2020-06-19 23:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12f3eb6061607796dcf6298f61bd5bfc SHA-1: e097810bff9905d43d613cef2aa1e455bf6155b3 SHA-256: 4fd99139c11cdae23f9005e5ca1fd7a7e7169491585cc171fc5199067fb9da8e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links to potentially malicious or unrelated PDF files indicates a deceptive or harmful intent, likely to drive traffic or distribute further malware.

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://a1pavingandmasonryli.com/uploads/1/3/0/5/130543878/130543878.html#evan+moor+daily+science+grade+4+pdf
    • http://downtownpueblo.com/uploads/1/3/1/3/131380045/9234320.pdf
    • http://chasingraynor.com/uploads/1/3/1/3/131384400/8cf17.pdf
    • http://rhondababington.com/uploads/1/3/0/3/130379549/sanarupeji.pdf
    • http://polarexpressne.net/uploads/1/3/0/7/130775196/zuxamovukepurep.pdf
    • http://innovacionpublicitariamagenta.com/uploads/1/3/1/4/131438362/xinaxa.pdf
    • http://miabethdesigns.com/uploads/1/3/0/7/130739027/4839774.pdf
    • http://childrensmuseumofnewnan.com/uploads/1/3/0/5/130589140/712d465375.pdf
    • http://thefrosteddoughnut.com/uploads/1/3/0/6/130621158/9faa1d257c6b3f.pdf
    • http://tcsonline.net/uploads/1/3/0/5/130589100/3101496.pdf
    • http://interieurschrijnwerken.com/uploads/1/3/1/1/131164375/75f61ce4c85.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_off00004111.bin
53cb797472b8ade018d26f61234d792beb615337ce25d895f7f4f35dae2dda81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4111 5392 bytes
font_01_sfnt_off00005359.bin
15a4eca51c2035658d4cffac98d385f5219a0f8f99cf98a2d58876f2d9e3cc7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5359 9544 bytes

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