Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01d01fd7d89cb53…

MALICIOUS

PDF

32.8 KB Created: 2020-05-25 05:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e631890c98befb6bbc8d08109ff9fadf SHA-1: 4328ca64d3e4578de45b9a030ea6be860d77ba6d SHA-256: b01d01fd7d89cb531cb42352f899bcd631b9778371760c68d0edec4c135a96a5
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on newly created domains and use numeric slugs, indicative of a link farm or SEO spamming technique. The document body, though partially corrupted, suggests a lure related to "Dragonwings test questions and answers". The ML classifier strongly flagged this PDF as malicious, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://maeganprovan.com/uploads/1/3/0/2/130271185/130271185.html#dragonwings+test+questions+and+answers
    • http://spot13studio.com/uploads/1/3/0/2/130288915/9211555.pdf
    • http://bouldercreekexteriors.com/uploads/1/3/1/4/131436972/wogufegovaset_larewir_wujatow.pdf
    • http://iphonephotoclub.org/uploads/1/3/0/8/130814935/90749.pdf
    • http://hancockbands.com/uploads/1/3/0/6/130621732/7342496.pdf
    • http://chrisbartold.us/uploads/1/3/0/5/130539981/muwukoboleje.pdf
    • http://daydreamerphotography.org/uploads/1/3/0/4/130477170/xezuve-basiwibelipenit.pdf
    • http://thekorchakgroup.ca/uploads/1/3/1/4/131456363/rerewaje-mibamumev-xikibub.pdf
    • http://ambriage.org/uploads/1/3/1/4/131437410/6301930.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_off00005570.bin
25a821cac2e9edeab61ce5a36aa615d824be2073cd5b7eb7cfbf5011ecec2147		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5570 10200 bytes

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