Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05a935ebe5426f3…

MALICIOUS

PDF

36.4 KB Created: 2020-05-15 12:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 02ff82758a762f061136371b3a795228 SHA-1: 8afb2114da2c404ecb6e3ef7f7c8c569980c88ba SHA-256: b05a935ebe5426f3765512557ca8be68e0b382e147fcc843ba58d4a21a75c145
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains numerous embedded URLs and a heuristic firing for a browser extension installation lure, indicating a social engineering attempt to trick the user into downloading and executing malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of many external links suggests a link farm or redirection mechanism. While no scripts were directly extracted, the overall structure and heuristics point to a malicious document designed for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gentlespiritsproject.com/uploads/1/3/1/3/131379443/131379443.html#mozilla+firefox+42.+0+2 PDF link annotation
    • http://dccltd.org/uploads/1/3/1/6/131636988/764930.pdfIn PDF document text
    • http://terrahowardphotography.com/uploads/1/3/0/7/130738527/tajarupajerugo.pdfIn PDF document text
    • http://generalmusicacademy.com/uploads/1/3/0/7/130739116/selok.pdfIn PDF document text
    • http://lakecumberlanddiscount.com/uploads/1/3/0/8/130814993/vowidajokutiduzo.pdfIn PDF document text
    • http://formormedia.com/uploads/1/3/0/7/130775858/jezarejabe.pdfIn PDF document text
    • http://chaoticdetour.com/uploads/1/3/1/4/131438257/nuritow.pdfIn PDF document text
    • http://mastermoose.ca/uploads/1/3/1/3/131379295/gugujuja.pdfIn PDF document text
    • http://gpfight.com/uploads/1/3/0/2/130272577/5991195.pdfIn PDF document text
    • http://adieapriyadi.net/uploads/1/3/0/2/130289353/gugimemogele_tudidejixexoso.pdfIn PDF document text
    • http://madeformorecreations.com/uploads/1/3/1/1/131163725/sebes.pdfIn PDF document text
    • http://peterpark1.com/uploads/1/3/1/3/131379554/2c544.pdfIn PDF document text
    • http://mark-sim.com/uploads/1/3/0/4/130476943/xubifumalasig.pdfIn PDF document text
    • http://thingz4u.com/uploads/1/3/0/6/130604671/busoxiguzuguxo.pdfIn PDF document text
    • http://northcarolinawatergardens.com/uploads/1/3/0/5/130588740/5734456.pdfIn PDF document text
    • http://martadance.com/uploads/1/3/0/4/130494478/rosivelupogixelaje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000638b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x638B 10252 bytes
SHA-256: 9c7baa547b1581c2b5d7a8de45cc6421306dcf11ff1d360bde3debc95c549e4e

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