Malicious PDF — malware analysis report

Static analysis result for SHA-256 492c070798ae3f3d…

MALICIOUS

PDF

37.1 KB Created: 2020-04-08 05:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f5620c463ffd1276ef75dd18e0b75cb9 SHA-1: a0eed118e5f258aab1086bfe69e002c6e5c69ddd SHA-256: 492c070798ae3f3d06830ee6392ea578b118095c7c792d080242b80c2a93db88
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by multiple heuristics, including ClamAV detection as 'Pdf.Dropper.Agent-9137185-0' and an ML classifier, indicating malicious intent. The document contains a large number of external links to other PDF files hosted on various domains, characteristic of a link farm. While no scripts were extracted, the structure and the sheer volume of outbound links suggest a mechanism for distributing further malicious content or for SEO manipulation.

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.
  • ClamAV: Pdf.Dropper.Agent-9137185-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9137185-0
  • 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://lindentreephotos.net/uploads/1/3/0/8/130874544/130874544.html#que+es+funcion+poetica+emotiva
    • http://alanbonilla.com/uploads/1/3/0/8/130814225/zevelizajojifisitope.pdf
    • http://recroomftl.com/uploads/1/3/1/3/131379525/xesiwetapila_peberemev.pdf
    • http://greenbergpianola.com/uploads/1/3/0/3/130313440/purif_buxuxa_girepew.pdf
    • http://viiasaunas.com/uploads/1/3/0/9/130969842/dodinuzidogokar_zibufuw_sufimejuwodi.pdf
    • http://prairieviewchurch.net/uploads/1/3/0/6/130621120/lilikeb.pdf
    • http://lasvegaspurplestar.com/uploads/1/3/0/4/130436441/19b4b74.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_off00006730.bin
fb7d1570037fe81cf07e6dac2b8599f1fde66d9114fd0ecead4e7a4d7f6dc04a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6730 8600 bytes

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