Malicious PDF — malware analysis report

Static analysis result for SHA-256 760f1e0673b17fd9…

MALICIOUS

PDF

40.5 KB Created: 2020-05-31 03:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a730d5dd2f8db2bfc72eac5821b358aa SHA-1: 0ef87abcecb92d821b208f9a4d888d39673802a0 SHA-256: 760f1e0673b17fd92f6fe2d78ba5faf07c8288df800bb4f176f6d347b09ba274
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many of which point to other PDFs with numeric slugs, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://english.meridiande.com/uploads/1/3/0/5/130589208/130589208.html#culture+in+interpersonal+communication
    • http://imatas.net/uploads/1/3/0/6/130621582/2608335.pdf
    • http://onlykneadsmassage.com/uploads/1/3/1/3/131383802/ec330c.pdf
    • http://second-nurture.com/uploads/1/3/1/3/131381891/xasedu-lixebetawipef-zutisojigeje.pdf
    • http://lightonwatertcm.com/uploads/1/3/0/3/130313428/xorexojofudef.pdf
    • http://braxiere.eu/uploads/1/3/0/6/130604804/sabewurulumevur-zaxar-bepuzula.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00007434.bin
d95b643817af6e25ddf85f1677ca1e0cbbcd50dd062a4a1bc70eacfa05a7f94a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7434 10136 bytes

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