Malicious PDF — malware analysis report

Static analysis result for SHA-256 450f15b506671cdc…

MALICIOUS

PDF

36.5 KB Created: 2020-04-11 09:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f095f967d5fa47e388d27e606d9d0513 SHA-1: 32074c6f9604cc985fc86c1fff6d1f86cb7275dc SHA-256: 450f15b506671cdcd2fd5824e6702f666f76ff9239e3879dac470556b075d9ca
154 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, a common technique for distributing malware or engaging in SEO link farming. The embedded URLs suggest a potential distribution or redirection mechanism, although no specific script was extracted to detail further payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • ClamAV: Pdf.Dropper.Agent-8422278-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8422278-0
  • 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://sta-66-99-58-206.ladse.org/uploads/1/3/1/6/131606480/131606480.html#anatomi+pdf+indir
    • http://quality-custom-apparel.com/uploads/1/3/0/7/130775676/4925880.pdf
    • http://rumbleandgroove.com/uploads/1/3/0/5/130539810/gosavigazi.pdf
    • http://bespokebabyballads.com/uploads/1/3/1/4/131453201/1288821.pdf
    • http://flowboardusa.com/uploads/1/3/0/4/130435633/powitoxamemesijuluz.pdf
    • http://adelpheproperties.com/uploads/1/3/1/3/131398411/cdee40.pdf
    • http://sharlenetoh.com/uploads/1/3/1/3/131398452/5719193.pdf
    • http://adelpheproperties.com/uploads/1/3/1/3/1313984
    • 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_off0000636d.bin
45e7c252dbd9261b306b8b998b1c4a58a52a89827ee4939da113fc4c69a91913		 pdf-font-stream PDF embedded font (sfnt) at offset 0x636D 9896 bytes

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