Malicious PDF — malware analysis report

Static analysis result for SHA-256 821a85ed2445a1b1…

MALICIOUS

PDF

45.4 KB Created: 2020-04-17 21:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c41d6b94f04ffdd9a40cc97dae0902b5 SHA-1: eec64ad755349f49e874fae06e1675f450288c0b SHA-256: 821a85ed2445a1b1579ec4133f57b2f7da76b7877baa7dc68f37c31ff6b5d907
96 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, identified by the PDF_SEO_LINK_FARM heuristic, which are likely intended to redirect users to malicious sites. The document body, though partially obfuscated, contains text related to an 'Aia group limited annual report 2015' and includes a URL that mirrors this context, suggesting a lure to disguise malicious intent. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://inlandcbd.com/uploads/1/3/1/4/131483337/131483337.html#aia+group+limited+annual+report+2015
    • http://predictiveinterventions.com/uploads/1/3/1/4/131407521/096892a180.pdf
    • http://psinapodproductions.com/uploads/1/3/0/4/130476669/56ccb706.pdf
    • http://chemicalfingerprints.com/uploads/1/3/1/3/131397934/5fb54c71f75ddb5.pdf
    • http://buttsbrosfarms.com/uploads/1/3/0/8/130813841/duluvinut-miniwivimodul-xumutos-safadulejot.pdf
    • http://meadowuniversity.com/uploads/1/3/0/8/130813642/nikepeduto.pdf
    • http://ricardomartinez.ca/uploads/1/3/1/4/131437785/reketilajul.pdf
    • http://exchangepartnership.com/uploads/1/3/0/7/130775012/rerowopufed-fowax-vetimadenefo-wafuzalivej.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_off0000890f.bin
51f3a7cf1f1dec9579bcf19876a4896cf5b34c92fbfe65e92116cd722347cac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x890F 8604 bytes

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