Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f799819ba855c0…

MALICIOUS

PDF

35.5 KB Created: 2020-03-21 11:50:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 04f8f1be98a94cb416719be1cccd2624 SHA-1: 0027e1c140d2efa133df6e5dd51e142843c50e22 SHA-256: 16f799819ba855c0a1f0efad394dccca0d0106245eb9266a2937a49f0285eb83
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, also contains URLs pointing to external websites. This suggests the primary purpose is to redirect users to a network of sites, likely for SEO spam or to host further malicious content.

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://mobulamanta.org/uploads/1/3/0/2/130287229/130287229.html#5+jugadas+de+ataque+en+baloncesto
    • http://mydbcommunity.com/uploads/1/3/0/2/130272906/pudutobutu-dexawamazipasa-wajepenetux.pdf
    • http://1957rams.org/uploads/1/3/0/2/130287441/riraduriteve-zuvor-vidibo.pdf
    • http://savagesrecords.com/uploads/1/3/0/6/130640047/bbb2e.pdf
    • http://www.sincyrlysally.com/uploads/1/3/0/6/130604088/c35969d0519.pdf
    • http://blackbutterflystrands.com/uploads/1/3/0/3/130313180/6292627.pdf
    • http://www.meetingspodcaster.com/uploads/1/3/0/7/130775404/gegoru_rolikuwojuzimir_vunid.pdf
    • http://unlazoenmovimiento.com/uploads/1/3/0/6/130604201/a5edd5bf.pdf
    • http://benstroud.com/uploads/1/3/0/3/130313005/9029931.pdf
    • http://server.vidalastudillo.com/uploads/1/3/0/8/130814526/9425592.pdf
    • http://www.mkpowerplayers.com/uploads/1/3/0/7/130776298/tixanabanu_winagipul_pidovefowinu.pdf
    • http://chyio.com/uploads/1/3/0/7/130740437/kulafuviwut.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_off00006446.bin
f98ee6ed291941c9ed7fdd5bb80541bf9e597e8f3ab877173f7a79ab2cb5c7c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6446 7844 bytes

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