Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf570b7860d303d3…

MALICIOUS

PDF

23.2 KB Created: 2020-04-22 09:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 267d5625d25337c055d9ce32c63ef5fd SHA-1: 8b5152574ca902f9c2f05802c8765cf4894ac423 SHA-256: cf570b7860d303d36a748ad05c2fdf5334ae736cab02882032ad9c25c3ba7848
116 Risk Score

Malware Insights

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

The PDF file is identified as an image-only lure, typical of phishing campaigns. It contains a click-outward action directing users to a series of SEO-optimized PDF links hosted on various domains. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of a link farm designed to lure users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 23 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://briaswaringam.com/uploads/1/3/0/6/130639246/130639246.html#3d+max+model+free++tree
    • http://mcpublications.com/uploads/1/3/0/6/130621214/224b160.pdf
    • http://milton-trails.com/uploads/1/3/0/7/130775866/tipedumopafegude.pdf
    • http://eng-of-eating.com/uploads/1/3/0/5/130539185/6ac12bbcf0.pdf
    • http://liquidcommon.com/uploads/1/3/0/7/130775050/30d2647.pdf
    • http://topfaceboook.com/uploads/1/3/1/3/131384559/komozofe_kupalipina_bevunegipebekag_luxofebo.pdf
    • http://xueqisong.space/uploads/1/3/0/5/130550868/pikopu-pukimudo.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_off00003ded.bin
095eaef7ce6d520f4c4740afd236d8f9cabf170b5588bea1e5a7ae8fba97904c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3DED 4856 bytes

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