Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3bdb58aef07f03…

MALICIOUS

PDF

44.9 KB Created: 2020-05-26 05:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 9fd55f464e8b04b6b71eca2f1755ff6d SHA-1: a9adaaa5674fb417afc7dcdead4ec32b22a5f6ee SHA-256: ef3bdb58aef07f03c18e383ec4351ec9070db4fea57c473e8b18773400273033
96 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, a technique often used for SEO spam or to redirect users to malicious sites. The primary heuristic identified a link farm of 30 external PDF links, suggesting a coordinated effort to distribute content or malware across multiple domains. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://thebusinesstip.com/uploads/1/3/0/5/130544067/130544067.html#eternal+sunshine+of+the+spotless+mind+poem PDF link annotation
    • http://crystalballexotics.com/uploads/1/3/1/4/131437967/tarafigo.pdfIn PDF document text
    • http://alcinemaksa.com/uploads/1/3/1/1/131164534/wiluj.pdfIn PDF document text
    • http://vvsphoto.com/uploads/1/3/0/2/130272417/gelalaxusuzitibebife.pdfIn PDF document text
    • http://pinetoplodge.com/uploads/1/3/1/4/131483453/4416899.pdfIn PDF document text
    • http://jubileefarmva.com/uploads/1/3/1/1/131163643/440b6.pdfIn PDF document text
    • http://bricknjhealthinsurance.com/uploads/1/3/0/5/130551823/7054147.pdfIn PDF document text
    • http://collinsphotography.org/uploads/1/3/0/5/130588847/4041101.pdfIn PDF document text
    • http://stronglandscapecontractors.com/uploads/1/3/0/6/130620470/533663.pdfIn PDF document text
    • http://chaitest.com/uploads/1/3/1/3/131380288/fenuretakorifi_sesadavuzofed.pdfIn PDF document text
    • http://jasonrefsland.com/uploads/1/3/0/5/130588956/voduvozasis.pdfIn PDF document text
    • http://viperfisharts.net/uploads/1/3/1/4/131482988/1818782.pdfIn PDF document text
    • http://tenessajadeflowers.com/uploads/1/3/0/3/130313411/susufejof.pdfIn PDF document text
    • http://townofgananoque.ca/uploads/1/3/0/5/130551222/balogig.pdfIn PDF document text
    • http://cpanel.thedaisyrose.com/uploads/1/3/1/4/131437864/3048563.pdfIn PDF document text
    • http://stepupcoaching.nl/uploads/1/3/0/5/130551130/gapes.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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 3

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_off00008598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8598 10100 bytes
SHA-256: 3b78f5bf508fa72a6c755592ef770288a9ed99cd9e84ec745b68056c794bcb31

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