Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38cc265b8e2e686…

MALICIOUS

PDF

45.7 KB Created: 2020-04-08 02:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 36f9f49bd93afa01d89d333be8b3caf7 SHA-1: bc945d76ca5a7fe680271e36bb755648508bf8c7 SHA-256: c38cc265b8e2e68672600096024c4e571bfd541dd0595d252f6e5b1bce2a26b6
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to redirect the user.

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://circleofstrengthnj.com/uploads/1/3/0/4/130476912/130476912.html#dimensiones+de+un+ladrillo+rojo
    • http://jaredmichaelj.com/uploads/1/3/0/5/130542965/nunezexata.pdf
    • http://topcincinnatibeautysalontraining.com/uploads/1/3/0/6/130603890/799e2e3f99b06d0.pdf
    • http://ivyfirerescue.org/uploads/1/3/0/2/130289355/8656980.pdf
    • http://trafficcontrolsignrental.com/uploads/1/3/0/9/130969921/kobizatigu_sivizosiniburuv_fegosupowo_zoworaj.pdf
    • http://peshtolina.com/uploads/1/3/0/7/130738596/povatewabu.pdf
    • http://enlightenings.net/uploads/1/3/0/2/130289224/36db9f0.pdf
    • http://dzaka1908.com/uploads/1/3/0/6/130639027/3819416.pdf
    • http://klstarsdesign.com/uploads/1/3/0/7/130739087/24459112.pdf
    • http://tysisland.com/uploads/1/3/0/6/130604109/8821860.pdf
    • http://bee-selective.com/uploads/1/3/0/6/130621814/tezotok-gukagixizu-pugurired.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006996.bin
34c24b5d0628d624d7ff07e26c9f1472be27de0c7ad8cf564d767a7248fd02b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6996 8380 bytes
font_01_sfnt_off000087bb.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87BB 4144 bytes
font_02_sfnt_off000094b1.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B1 16036 bytes

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