Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5386bce51b7b1a…

MALICIOUS

PDF

50.3 KB Created: 2020-03-20 03:27:23 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: 4f42b996b109c82500168a1ef4a05e78 SHA-1: f768c7800a01392b2bfe229036dad1660cbf7d95 SHA-256: 9b5386bce51b7b1a76fd21bab714e584d95b6076962c27f5f58420050f4416cf
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains. This pattern is indicative of a link farm or a distribution mechanism for further malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to these external resources. No scripts were extracted, limiting the analysis of direct payload execution.

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://hyperion-ai.com/uploads/1/3/0/8/130814874/130814874.html#par+biomagnetico+pdf PDF link annotation
    • http://brentsmassagetherapy.com/uploads/1/3/0/6/130620880/408f2052529ecc2.pdfIn PDF document text
    • http://skylinesjewellery.com/uploads/1/3/0/5/130547142/famexusinogu_jekimuma.pdfIn PDF document text
    • http://gruporegadafe.net/uploads/1/3/0/7/130776503/2258538.pdfIn PDF document text
    • http://rkplasticsurgery.com/uploads/1/3/0/4/130483067/derovizem.pdfIn PDF document text
    • http://racebaseuk.com/uploads/1/3/0/7/130775700/904255.pdfIn PDF document text
    • http://professionalsinteam.com/uploads/1/3/0/6/130604230/932e1f.pdfIn PDF document text
    • http://midnightepiphanyband.net/uploads/1/3/0/6/130639766/lanuvab_kuzuretuxini.pdfIn PDF document text
    • http://whiskeybusinessband.com/uploads/1/3/0/5/130547373/muxafumarulu_detize_goxorukenaxovos.pdfIn PDF document text
    • http://www.echelonelectricllc.com/uploads/1/3/0/8/130813966/861451d.pdfIn PDF document text
    • http://www.smallcommun.com/uploads/1/3/0/4/130476597/rajoxelonezasukisel.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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D34 9040 bytes
SHA-256: dceb23228e5ee8edad0e79391e5ae6d908ea0d7f4c290024b4e7afe0b9c53130
font_01_sfnt_off00009ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DDF 2596 bytes
SHA-256: 87fd6b1a35a64f5c2d30902eea89631a9c05d6b36ef70c6d0cee4d2ad867525e
font_02_sfnt_off0000a6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6FD 16080 bytes
SHA-256: 5850b776a9fe8e14235cd948a2a79b82231bfcf78698958d2266fda84affc865

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