Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92d89f567a23356…

MALICIOUS

PDF

36.5 KB Created: 2020-06-03 14:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2be381020add4469983dbe65e0d2833c SHA-1: 09bfffc986457ed3537dcf50c0fa15ee6febb9be SHA-256: c92d89f567a233565ce11ba0013a3ddb651e555578ec941107cdc1e0dc0dd35e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which are structured as SEO spam, pointing to unrelated domains. The document body, though partially corrupted, suggests a lure related to an 'Imusa electric pressure cooker manual'. The ML classifier strongly indicates maliciousness. The primary attack pattern involves directing users to potentially malicious websites through a link farm disguised as relevant content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://4lr.undesirable.us/uploads/1/3/1/1/131164352/131164352.html#imusa+electric+pressure+cooker+manual
    • http://tenzafansite.com/uploads/1/3/0/8/130874606/4167332.pdf
    • http://venture-smith.org/uploads/1/3/1/4/131438316/vijadabamopuv-fojep-wegezitenob-xadipuwumurusaw.pdf
    • http://germanclassicsdepot.com/uploads/1/3/0/2/130272470/xeganuxigiwujo.pdf
    • http://achughes.net/uploads/1/3/1/4/131453734/cc07b9e2.pdf
    • http://4lr.undesirable.us/uploads/1/3/1/1/131164352/terms.html
    • http://4lr.undesirable.us/uploads/1/3/1/1/131164352/dmca.html
    • http://4lr.undesirable.us/uploads/1/3/1/1/131164352/policy.html
    • https://somotug.files.wordpress.com/2020/05/29359912755.pdf
    • https://pijepax.files.wordpress.com/2020/06/31549085282.pdf
    • https://wizuvife.files.wordpress.com/2020/06/motiwefag.pdf
    • https://ponevigafoti.files.wordpress.com/2020/06/58476422226.pdf
    • https://xanadejukew.files.wordpress.com/2020/06/zerugifozafige.pdf
    • https://foxunisi.files.wordpress.com/2020/06/51709476851.pdf
    • https://retixuk.files.wordpress.com/2020/06/bapakinekokarip.pdf
    • https://xesovegera.files.wordpress.com/2020/06/42321637852.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_off00006146.bin
7a986aa99ac066d0e8515bbf6370eba39987b0042927e16f6ff3c64625577b47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6146 10940 bytes

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