Malicious PDF — malware analysis report

Static analysis result for SHA-256 12207c61d74d47da…

MALICIOUS

PDF

32.2 KB Created: 2020-04-13 12:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6656e622dbd403afd7e91c501cc7b100 SHA-1: 52348ffbd2e87773c33006ab89d83c0ec4d8757e SHA-256: 12207c61d74d47daef0c87b3f99cb91d182adebcd5ed71c73f79b9cb1b9747bb
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are structured as a link farm. The document body, though heavily obfuscated, contains URLs that appear to be part of this link farm, suggesting a phishing or redirection attempt. The ML classifier strongly indicates maliciousness, and the PDF structure with numerous external links points towards a malicious intent to redirect users to potentially harmful sites.

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://carlosdia.com/uploads/1/3/0/6/130639498/130639498.html#celestron+nexstar+8se+computerized+telescope+with+deluxe+accessory+kit
    • http://2ndchance-thriftstore.com/uploads/1/3/0/4/130489423/witawajuwigefab-zuzepozesop-vonigo-sejite.pdf
    • http://sagasandsages.com/uploads/1/3/0/5/130589230/maxubus_refugeze_zasavelupeb_rijuxexesa.pdf
    • http://mandipeeklpc.com/uploads/1/3/1/3/131381464/pinan.pdf
    • http://closerwithgod.com/uploads/1/3/1/4/131406294/862d81f0.pdf
    • http://lovingfatima.com/uploads/1/3/0/4/130483956/ginizerezalaviv.pdf
    • http://vlascc.com/uploads/1/3/0/8/130874521/sofigub.pdf
    • http://emporiobs.com/uploads/1/3/0/6/130621708/7959499.pdf
    • http://whittenwool.com/uploads/1/3/0/7/130775199/17d25f.pdf
    • http://moldalbany.com/uploads/1/3/1/4/131408252/73ff800cb48c45.pdf
    • http://sandhillsranch.net/uploads/1/3/0/5/130543169/5606335.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_off00005416.bin
8ff4d5f637b3559c59b308c012435ba9787062a310f249c835260abcae9bc3d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5416 7656 bytes

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