Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a812d4606c0a87c…

MALICIOUS

PDF

35.7 KB Created: 2020-04-12 23:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cc686fd314471da31f644739bba6af7c SHA-1: 8bf40b11793e227d1098b075faf3f02205a96798 SHA-256: 7a812d4606c0a87c896818d8b5f936d019bcc643f044b77bf0cd6463de713b02
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML_NYX_PDF_MALICIOUS heuristic strongly indicates malicious intent. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of compromise, likely leading to further malicious content or phishing pages.

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://crisperfeitocorretora.com/uploads/1/3/1/4/131406202/131406202.html#jetnet.aa.com+retiree+travel
    • http://propulsioneers.net/uploads/1/3/0/2/130288486/7637878.pdf
    • http://ludsonline.com/uploads/1/3/1/3/131398362/6698137.pdf
    • http://offdutyclub.com/uploads/1/3/0/7/130776661/xafawefabumasob-dejanegiv.pdf
    • http://martinezortholv.com/uploads/1/3/1/4/131452988/7473551.pdf
    • http://riddlesteel.com/uploads/1/3/1/4/131453151/rixujipopofira-xarivipe.pdf
    • http://missouri-nationals.com/uploads/1/3/0/5/130551754/9525287.pdf
    • http://sumant.in/uploads/1/3/0/8/130874535/6692905.pdf
    • http://anidea.company/uploads/1/3/0/2/130287886/nosiku.pdf
    • http://theyahoomagician.com/uploads/1/3/0/9/130969317/2650608.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_off00006273.bin
4b43192743c394d6cb4330af84ef60bcf5655c21f690ef677e876ee9ce705608		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6273 8596 bytes

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