Malicious PDF — malware analysis report

Static analysis result for SHA-256 306011339eb20715…

MALICIOUS

PDF

70.2 KB Created: 2020-04-13 07:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 12798f9f9f2afb8937ad6732a7be0f78 SHA-1: 4736619ba3a7647b9ea0ded533eb6bd0a8310f67 SHA-256: 306011339eb20715e847dfa70c79843d9c5f7fa40c3bca5f779f041abf15626c
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to unrelated domains and appear to be part of an SEO link farm. The document body, though heavily obfuscated, contains keywords related to medical procedures, suggesting a lure to attract clicks. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent behind the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://woodlandstuition.com/uploads/1/3/0/8/130874073/130874073.html#rapid+sequence+intubation+drugs+pediatrics
    • http://girlslikeme.net/uploads/1/3/1/3/131384256/wimozudodo.pdf
    • http://wellingtonproject.org/uploads/1/3/0/8/130814187/gibemevizibo_velosezuvaro_riwupoti.pdf
    • http://nooracademyonline.com/uploads/1/3/1/0/131070071/piruxebe_guzewiruzepa_mupixamusafapoz_bodigakepidigi.pdf
    • http://destinationsbydawn.org/uploads/1/3/0/4/130491418/ce6c113d6e.pdf
    • http://backourblue-westrichland.com/uploads/1/3/0/8/130873710/9e40b4f5ff0.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_off0000ec30.bin
e1bbeb6be520c56487287eb692a0989b53c98793596703722811656760eb89e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 8592 bytes

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