Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb9bdfc41c8c4e0…

MALICIOUS

PDF

37.3 KB Created: 2020-03-24 20:56:22 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ec49cb90926ab053000d28df03b49297 SHA-1: ee8814b3260911eb0e0c522fe727b5bf46fc5475 SHA-256: fcb9bdfc41c8c4e0b7641fc38ed374c2aa4af02297980acd855028d95628dc54
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external resources, indicative of a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, suggests it is disguised as educational material ('Guia de matematicas tercer grado de secundaria') to entice users to click on the malicious links.

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://mhtdbtest4739.com/uploads/1/3/0/6/130620674/130620674.html#guia+de+matematicas+tercer+grado+de+secundaria
    • http://crestatlaurelwoodfinancing.com/uploads/1/3/0/5/130590661/nexefinaxixosi.pdf
    • http://superioradultdaycare.com/uploads/1/3/0/7/130775923/72dd8d12.pdf
    • http://jamesmacleodsculpture.com/uploads/1/3/0/2/130287289/185b75a2.pdf
    • http://lebonregistre.com/uploads/1/3/0/5/130590059/3662293.pdf
    • http://adlevo.io/uploads/1/3/0/4/130490444/memegi.pdf
    • http://www.ntgc.org.uk/uploads/1/3/0/2/130274281/8951475.pdf
    • http://happislem.com/uploads/1/3/0/4/130477455/2319499.pdf
    • http://healthcareindustryconsultants.com/uploads/1/3/0/9/130969937/c35e5d1d.pdf
    • http://401kmoneymanager.com/uploads/1/3/0/5/130539768/deganuteje-jivireda.pdf
    • http://frankhatesyou.org/uploads/1/3/0/2/130289214/tuwabagipaxu.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_off00006385.bin
76cc16e35f37570b0fde2a0ed2a2017ba894027396eaaa3de397920b71fbc2fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6385 9904 bytes

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