Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6036c25673e92a…

MALICIOUS

PDF

34.7 KB Created: 2020-06-10 15:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: f715e19468408eb522310c0f70be9055 SHA-1: 888d68d1a67fa9d475a2fcebbaf678ebf63ee797 SHA-256: 7d6036c25673e92a7fc0f6a6bf689c0389b5009ae60fdb0d23512ebece55091b
104 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are hosted on suspicious domains and appear to be part of a link farm. The document body text, though partially corrupted, includes the phrase 'Facture d'avoir exercice corrigé', suggesting a lure related to invoices or payments. The ML classifier strongly indicated maliciousness, and the presence of many external links points towards a phishing or credential harvesting attempt.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://kinkiosk.com/uploads/1/3/1/3/131384281/131384281.html#facture+d%2527+avoir+exercice+corrig%25C3%25A9 PDF link annotation
    • http://dazzlingexpressions.net/uploads/1/3/0/7/130738501/7303488.pdfIn PDF document text
    • http://dfs-tech.net/uploads/1/3/0/2/130271011/6702925.pdfIn PDF document text
    • http://medicalwhitepapers.com/uploads/1/3/0/9/130969316/1178043.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://karawalugut.files.wordpress.com/2020/06/jutoxumarewuzipuramasok.pdfIn PDF document text
    • https://nirakopifaz.files.wordpress.com/2020/06/zudafi.pdfIn PDF document text
    • https://xadixijep.files.wordpress.com/2020/06/ziwokumexawuvalifinixoj.pdfIn PDF document text
    • https://rudagus.files.wordpress.com/2020/06/zunalafijiwopabop.pdfIn PDF document text
    • https://sifuloli.files.wordpress.com/2020/06/35473568030.pdfIn PDF document text
    • https://rekinirive.files.wordpress.com/2020/06/595843594.pdfIn PDF document text
    • https://kuvimuzatep.files.wordpress.com/2020/06/13376867892.pdfIn PDF document text
    • https://piwunis.files.wordpress.com/2020/06/lemijolijetofas.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A10 11052 bytes
SHA-256: cb731360c1edca5a8eedc027baef724e75c81554a57ce18a22061bd23ba31574