Malicious PDF — malware analysis report

Static analysis result for SHA-256 871d7c7a7e8608c2…

MALICIOUS

PDF

42.1 KB Created: 2020-04-09 09:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 9937aaf99bd59eb76137a59d83e19e48 SHA-1: 0af18cf2820af39d7816cd64798ffd57f97b54d6 SHA-256: 871d7c7a7e8608c2f492debf6d1cf476eb21b7e0bfe76026bbbef3775883f2ee
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The document body, though partially corrupted, contains text related to English exercises and mentions wkhtmltopdf, indicating it was likely generated programmatically. The presence of numerous external URLs, including one that appears to be an HTML file, strongly suggests an attempt to redirect the user to malicious content or phishing sites.

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://chantaljeanpierre.com/uploads/1/3/0/7/130738909/130738909.html#ejercicios+de+numeros+cardinales+y+ordinales+en+ingles PDF link annotation
    • http://aspirecycling.eu/uploads/1/3/1/1/131163863/lopuzeru-jovatexariv-fawale.pdfIn PDF document text
    • http://campinabox.camp/uploads/1/3/0/6/130604952/e041826c9d1.pdfIn PDF document text
    • http://debonteavond.com/uploads/1/3/0/7/130775350/vosiwojipiboruv_majuxevage_runonesup_wezojikutemawu.pdfIn PDF document text
    • http://hairbyelliesiegert.com/uploads/1/3/0/5/130588390/9698321.pdfIn PDF document text
    • http://thebestspicecompany.com/uploads/1/3/0/2/130289551/6e4423.pdfIn PDF document text
    • http://besutobites.com/uploads/1/3/0/6/130604424/tovanigikoxupus-xulikusa-mejefuzubati.pdfIn PDF document text
    • http://namdalseidmusikklag.no/uploads/1/3/0/9/130969090/4487968.pdfIn PDF document text
    • http://goodfoodgreaterfredericton.com/uploads/1/3/0/9/130969185/lanun-vavimekujo-lozaduxa-dinuno.pdfIn PDF document text
    • http://allisonnickens.com/uploads/1/3/0/6/130604032/purutanag.pdfIn PDF document text
    • http://devereuxazkids.org/uploads/1/3/0/6/130620712/1755985.pdfIn PDF document text
    • http://farm-art.net/uploads/1/3/0/8/130873872/1a953.pdfIn PDF document text
    • http://choiceusinfo.com/uploads/1/3/0/6/130605292/9731aef26.pdfIn PDF document text
    • http://charlottejackman.com/uploads/1/3/0/8/130874034/7823412.pdfIn PDF document text
    • http://texasgymrats.com/uploads/1/3/0/7/130739446/6cea6e5.pdfIn PDF document text
    • http://compassionatelivingcourse.com/uploads/1/3/0/5/130543980/dodesepanakebus_nunukok_jatazelexox_juxumomulate.pdfIn 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

Related samples 2

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_off0000769f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x769F 9468 bytes
SHA-256: e6e7d31edceb1cfd98167c767b7ec681086e01a9fde9af7f26ed27a89cbe49fb

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