Malicious PDF — malware analysis report

Static analysis result for SHA-256 81811193abe64e03…

MALICIOUS

PDF

27.5 KB Created: 2020-04-22 08:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5693265278915ae10d5519bda2b2323b SHA-1: b6383af0472a21afd0a8de8bc5ad26716861ebba SHA-256: 81811193abe64e0330d1e3313a532defa892c3d72bc87fd0e502395db6c95915
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many of which point to other PDFs hosted on similar domains. This behavior is indicative of a link farm or SEO spam campaign, likely intended to drive traffic or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kenraye.net/uploads/1/3/0/3/130324326/130324326.html#char-+broil+performance+series+replacement+burner
    • http://odrtraining.net/uploads/1/3/1/1/131164063/xuxurozemevigi-mujaxekonukaw.pdf
    • http://tadpole.store/uploads/1/3/1/4/131437625/zuzisuvagomoba-pilisam-gasaw-tofijafuz.pdf
    • http://subbogies.net/uploads/1/3/0/2/130270904/xebujetudu_natatedaser.pdf
    • http://250sign.com/uploads/1/3/1/6/131607232/2312038.pdf
    • http://loriniedereart.com/uploads/1/3/0/7/130775921/wasekoxepu.pdf
    • http://libertysparksltd.com/uploads/1/3/0/2/130289628/direbekekuseb_mogex_rugij_xuvosenomupon.pdf
    • http://sacredowlhealing.com/uploads/1/3/1/4/131437826/xofoxeludekegu.pdf
    • http://troyshouseofshoes.com/uploads/1/3/0/6/130639545/c833ef9c.pdf
    • http://theritzhoteledinburgh.scot/uploads/1/3/0/5/130588286/117996.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_off000047ae.bin
3b0fb0918afcebb9c2136af2199b3efe741bd2b01e207a33216d5573d396ca13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47AE 6664 bytes

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