Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdf5c7a10dc9c12…

MALICIOUS

PDF

30.6 KB Created: 2020-04-13 14:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1bf73ef96bdbb541b9e71f665367e2f1 SHA-1: dd1bd046e3555829ecd365e6c92c0c0e29c20e96 SHA-256: 9fdf5c7a10dc9c125f240ce8075d08d69c0f0c697c793a1d7edd51baabf6ae05
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are structured as SEO-optimized URLs pointing to other PDF documents. This behavior is indicative of a link farm used to distribute malicious content or conduct phishing attacks. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://gomriz.com/uploads/1/3/0/7/130776500/130776500.html#two+step+equations+integers+worksheet
    • http://invibemusictherapy.com/uploads/1/3/0/5/130544313/fabubaxoware-segekud-negafawezomiluw.pdf
    • http://thecarolynkennedy.com/uploads/1/3/1/4/131454932/vuwifower.pdf
    • http://badmojostudios.com/uploads/1/3/1/3/131383998/mokelis-jojorowo.pdf
    • http://mirmargems.com/uploads/1/3/1/4/131408620/c51482cc2.pdf
    • http://upclosestand.com/uploads/1/3/1/6/131637814/ronepagiwijaped.pdf
    • http://theblogbyalisha.com/uploads/1/3/1/3/131383645/c2ed156e2f5b4e.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_off00005053.bin
dcb08ff91536c0d92439df1b434052b5311d2f6bc3da857f1b7f419bdc610fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5053 7752 bytes

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