Malicious PDF — malware analysis report

Static analysis result for SHA-256 92742266db5fcaf3…

MALICIOUS

PDF

32.7 KB Created: 2020-04-10 07:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 07b614f122fa4c7fc827b0b284dd6fe6 SHA-1: 8ddc9726c141446a14a3b8c9de6d8dad7a5f68dd SHA-256: 92742266db5fcaf30ec1f5ad098c077ee87ad6448dfe02195bffa57068a9acb9
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 to various domains, indicating it functions as a link farm. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to direct users to other potentially malicious resources. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ridehercup.net/uploads/1/3/0/5/130543575/130543575.html#fichas+de+refuerzo+y+ampliacion+matematicas+1+primaria+santillana
    • http://onherknees.com/uploads/1/3/0/2/130289365/nodilogowusok_najarobi_fizomi_dosizobonuruw.pdf
    • http://chelseaeaton.com/uploads/1/3/0/7/130739046/sawupibuzupaze.pdf
    • http://consultoriaenseguridadciudadanacrya.com/uploads/1/3/0/7/130739080/lenul-gunivese-furaso.pdf
    • http://luxuryprintsllc.com/uploads/1/3/1/3/131379045/nizabuv_giwadowibu_xulovisejuluza_patovadiliz.pdf
    • http://robinsonandmartinoforwatchungcouncil.com/uploads/1/3/1/4/131437561/2646326.pdf
    • http://divebarcatering.com/uploads/1/3/0/7/130739483/cefc75a1a.pdf
    • http://familyunitedservicesinc.org/uploads/1/3/0/7/130776776/3280878.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057b3.bin
0e4c346766e0c18ea206b8ee2a83af89253ff87af774e62d4b3687a90c1c1644		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57B3 7512 bytes

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