Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc692c280b9d2d2…

MALICIOUS

PDF

41.4 KB Created: 2020-04-02 18:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2afd404777ea078c0f72ca0f3cb6d1dc SHA-1: ecac7f4c13baf95e7f44fdb14bb6c524727cd5ec SHA-256: 5bc692c280b9d2d27f598b338d98d7607ba88025767a4bfb16ac84d6f4b91ffe
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links pointing to various domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to potentially malicious content or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://mychinesewatch.com/uploads/1/3/0/7/130775961/130775961.html#i+was+there+to+hear+your+borning+cry+story
    • http://4squareandseven.org/uploads/1/3/0/2/130274319/674b23a1291353.pdf
    • http://thecountrycitygirl.com/uploads/1/3/0/2/130270776/b6209956d2ac03.pdf
    • http://konges.store/uploads/1/3/1/3/131383309/1894163.pdf
    • http://livingfashions.net/uploads/1/3/1/4/131453818/tenoxuwadabora.pdf
    • http://thebiryanibox.net/uploads/1/3/0/9/130969498/1149682.pdf
    • http://amarantepatrimoine.com/uploads/1/3/0/5/130550887/8009833.pdf
    • http://caballerocpa.com/uploads/1/3/0/6/130604911/xirebugo-lerukijukok-verofusubusipob-subenotebex.pdf
    • http://learnenglishnewyork.com/uploads/1/3/0/5/130546000/7609405.pdf
    • http://p2uelectrical.net/uploads/1/3/0/6/130604556/dc7f59.pdf
    • http://humanitybracelets.org/uploads/1/3/0/7/130740351/9402e79461757.pdf
    • http://embodimentbykait.com/uploads/1/3/0/6/130621450/983de9.pdf
    • http://station�r-gamingdator.se/uploads/1/3/0/6/130604193/1928962.pdf
    • http://mjarden.com/uploads/1/3/1/4/131408183/22fbe13b69.pdf
    • http://waytobe.net/uploads/1/3/0/6/130603773/3498057.pdf
    • http://makelemonade.shop/uploads/1/3/0/7/130738814/bogavanito.pdf
    • http://blyssworks.ca/uploads/1/3/0/8/130814083/75d5d6161.pdf
    • http://xn--stationr-gamingdator-hzb.se/uploads/1/3/0/6/130604193/1928962.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_off0000788e.bin
0a9b0a72115e31a049ace3b99c32fbca5e31e68c3d922184124bbb6d392075bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x788E 8044 bytes

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