Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfb49668da1aaa9…

MALICIOUS

PDF

27.9 KB Created: 2020-06-20 17:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6e0d3dee5ceb7b383cb9b143d235854 SHA-1: 0eecc35d99d412bd389af93eb026e4584485be7c SHA-256: ecfb49668da1aaa99af484384fd794124f6941f801ce8d08c7a4bebbd2a229b3
114 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, designed to trick users into clicking an embedded link. The document body and heuristics reveal a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 2 text block(s), carries a click-outward action, and is only 27 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://kevsphotobooth.com/uploads/1/3/0/7/130739280/130739280.html#sistema+ohsas+18001+pdf
    • http://carepackagesbyvee.com/uploads/1/3/1/8/131871910/tomenujevuferis-fefaxas-zepezeterevag-zizani.pdf
    • http://lwt2.voyagerwebsites.com/uploads/1/3/2/6/132683000/kolugenijavokeb.pdf
    • http://wordupcafe.com/uploads/1/3/0/8/130814104/kaduberine-sipuviganufelo.pdf
    • http://smfperformancehorses.com/uploads/1/3/0/3/130379352/8822917.pdf
    • http://jabbathehuttbutt.com/uploads/1/3/1/4/131407802/zinozaxo.pdf
    • http://barrons-indywomen.com/uploads/1/3/1/4/131407494/mexituvox-gisevif-dezedabixopas.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003458.bin
066583f2b6b7ec6f82d407f568f97548f71fbaf75124a320581b9342782cb708		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3458 5324 bytes
font_01_sfnt_off0000466e.bin
d801c61eccb3938ed21727413ea2976076c6749e41a475332a3f3569a03e3eac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x466E 8360 bytes

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