Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3236383ba0ba8b…

MALICIOUS

PDF

37.5 KB Created: 2020-06-11 23:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f20c30ac01e67dd2fbc55737a77a4f03 SHA-1: 0ecf71c7bba1ba3915349218eb55e5a2c1d84a3f SHA-256: 7b3236383ba0ba8b79c729732a45e31edb70d3340fcc53cced5a9f80c91656f2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs likely lead to further malicious content or phishing pages, and the document's structure suggests a link farm or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://bestplacesinohio.com/uploads/1/3/0/8/130813648/130813648.html#house+plants+guide+pictures
    • http://elainestandohar.com/uploads/1/3/0/4/130476442/lelereletenato-nibijetuxigim.pdf
    • http://simplegina.com/uploads/1/3/0/7/130776836/ce74ad8a.pdf
    • http://mobull.net/uploads/1/3/1/4/131452872/gediruneg.pdf
    • http://learningdoesmakesense.com/uploads/1/3/1/0/131070125/magefolerime.pdf
    • http://yekabruner.com/uploads/1/3/1/3/131398367/4813258.pdf
    • http://jeffersonstudio.com.au/uploads/1/3/0/6/130604011/jagiforolix-ruwefojajemuzi-fabovapisunis-lexideta.pdf
    • http://megshiffler.com/uploads/1/3/0/3/130323411/4c60f8a08a3.pdf
    • http://charisministries.org/uploads/1/3/0/5/130551192/7774083.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://suvasebe.files.wordpress.com/2020/06/97366817180.pdf
    • https://zopowozofoje.files.wordpress.com/2020/06/vojakuz.pdf
    • https://lasogotunule.files.wordpress.com/2020/06/rofefixevizosexajelax.pdf
    • https://wiguzigeb.files.wordpress.com/2020/06/reduziwumarovipob.pdf
    • https://fowemagafob.files.wordpress.com/2020/06/36408215466.pdf
    • https://lasogotunule.files.wordpress.com/2020/06/85745894787.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006848.bin
816c78547eb8dece0c978aeb126aa64201be277831e0894cf91a14455e56d972		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6848 10020 bytes

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