Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9e3efa7b57b459…

MALICIOUS

PDF

35.1 KB Created: 2020-06-03 23:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 9bd1b09d4d2144fd8f7686df68ac54ab SHA-1: 69909fec8981a64f55044e2db7f5ad06c1a632aa SHA-256: 4d9e3efa7b57b45918dc40f6a400eeccd2a2bd3db1ba2b614518c523a338e359
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded external links, indicating a link farm or SEO poisoning attempt. The PDF_LAUNCH heuristic firing suggests that the document is designed to trigger an action, likely directing the user to one of the numerous external URLs. The ML classifier strongly indicates maliciousness. No scripts were extracted, limiting the analysis of direct 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.
  • Launch action high PDF_LAUNCH
    PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
  • 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://smokin.tires/uploads/1/3/0/9/130969659/130969659.html#graphing+lines+and+inequalities+worksheet PDF link annotation
    • http://benjohnsontragedy.com/uploads/1/3/0/6/130605351/rasatub-fipemipinalobe-xoxum.pdfIn PDF document text
    • http://motoinspektor.com/uploads/1/3/0/5/130546457/bc5e794b.pdfIn PDF document text
    • http://alltheboxndice.com/uploads/1/3/0/2/130291712/7193950.pdfIn PDF document text
    • http://dkrhomestaging.com/uploads/1/3/0/5/130539155/d7f71296ac.pdfIn PDF document text
    • http://hostmaster.paperclippenguin.com/uploads/1/3/1/3/131397997/zosufuwu_xoniwisizap_terev_gometimotoluf.pdfIn PDF document text
    • http://ben-collie.com/uploads/1/3/1/4/131438151/loveregu-zozodojo-ropeziwafin-lobizevimaxopi.pdfIn PDF document text
    • http://launch.ctk.net/uploads/1/3/0/5/130551323/pilexenoz.pdfIn PDF document text
    • http://smokin.tires/uploads/1/3/0/9/130969659/terms.htmlIn PDF document text
    • http://smokin.tires/uploads/1/3/0/9/130969659/dmca.htmlIn PDF document text
    • http://smokin.tires/uploads/1/3/0/9/130969659/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://vemazoxubisi.files.wordpress.com/2020/06/84620870454.pdfIn PDF document text
    • https://nemopopa.files.wordpress.com/2020/06/wosuzipagelagixofipimak.pdfIn PDF document text
    • https://febiralugo.files.wordpress.com/2020/06/37374050690.pdfIn PDF document text
    • https://vemupuki.files.wordpress.com/2020/06/sivagesizo.pdfIn PDF document text
    • https://kosezupawi.files.wordpress.com/2020/06/98085850982.pdfIn PDF document text
    • https://zanixef.files.wordpress.com/2020/06/97679652864.pdfIn PDF document text
    • https://muwafinatub.files.wordpress.com/2020/06/sekuragan.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

Related samples 1

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_off00005e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E21 10076 bytes
SHA-256: 8f8d9d43ee300a7fe29910d114074ede54b76977226cb0f24fe0a11e592ef8d1

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