Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c88d66df227f517…

MALICIOUS

PDF

35.1 KB Created: 2020-04-21 11:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 09638d01e317f8a7474729bb01382c2f SHA-1: da46986351aa062a90620e680b5667361aad98b7 SHA-256: 1c88d66df227f517a52f41781c579b81f12548d04f49a702440fc594c9aa32ac
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links to various domains, suggesting a link farm or redirection scheme. The document body contains a mix of seemingly random text and URLs, further supporting the idea of SEO manipulation or a lure to external content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://fundraisers-aylsham.com/uploads/1/3/0/5/130540214/130540214.html#ayyappa+patalu+audio+songs+ing
    • http://veconcreting.com/uploads/1/3/0/4/130490078/7967293.pdf
    • http://fickleforge.com/uploads/1/3/0/5/130538985/935ee2e9be.pdf
    • http://tdwcommunications.com/uploads/1/3/1/3/131398347/32366.pdf
    • http://nmwild.com/uploads/1/3/1/4/131412491/fokurusininituv-xegukafebuz.pdf
    • http://writingbystacey.com/uploads/1/3/1/6/131636917/5ee303f5d82c0.pdf
    • http://www.anafaros.se/uploads/1/3/1/4/131438187/kufibejolajozoso.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_off00004a4b.bin
e30c8a2c74ce27d40b51b18f8a3296c467fe53f589c7a0ca3b17a1f6561a2883		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A4B 7880 bytes
font_01_sfnt_off000068eb.bin
322701f1f7ce52f1e2c270a0bb3090cbbccd2613e2548c816e08e746c3346379		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68EB 16344 bytes

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