Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf024b14b6aed54…

MALICIOUS

PDF

34.5 KB Created: 2020-04-01 20:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 5086d281bfc3a522d33d7d8072286be7 SHA-1: 11ff1ab89d741625d86deeb60bfbb263be902cf8 SHA-256: 2bf024b14b6aed544637278dd49a65d032579aaf8d9ef4bc31fb318123660077
96 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains the title 'Libro disciplina con amor' and references 'wkhtmltopdf', suggesting it was generated programmatically. The primary function appears to be acting as a link farm, directing users to numerous other PDF files hosted on various domains, which is a common tactic for SEO manipulation or distributing malicious payloads.

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://rktttherapy.com/uploads/1/3/0/5/130546415/130546415.html#libro+disciplina+con+amor PDF link annotation
    • http://cletusryan.com/uploads/1/3/1/3/131383821/favit.pdfIn PDF document text
    • http://feliciasspotlesscleaning.org/uploads/1/3/0/7/130776676/ed88f2e5.pdfIn PDF document text
    • http://ivysshop.com/uploads/1/3/0/2/130288402/5fb437e.pdfIn PDF document text
    • http://costassolutions.com/uploads/1/3/0/2/130289738/31f6d96d94.pdfIn PDF document text
    • http://goldenblade.ch/uploads/1/3/0/9/130969775/60f92701e7e66.pdfIn PDF document text
    • http://atlashcare.com/uploads/1/3/0/4/130483973/8642794.pdfIn PDF document text
    • http://forexpert.org/uploads/1/3/0/7/130739706/9111070.pdfIn PDF document text
    • http://getfreepix.com/uploads/1/3/0/5/130589316/dizud_kegilulogonideb_mifuwejubonaxo.pdfIn PDF document text
    • http://arcadesalvacioncarpinteria.com/uploads/1/3/0/6/130621786/bukojaxonilowekogux.pdfIn PDF document text
    • http://christophergriffiths.com/uploads/1/3/0/4/130483573/fogiluma_zolukulufonavin_zasatefaw_bugajoz.pdfIn PDF document text
    • http://devmono.com/uploads/1/3/1/0/131069860/lotusuxomawetizorebu.pdfIn PDF document text
    • http://gaumukhtapovantrek.com/uploads/1/3/0/3/130379293/55badfe34beee.pdfIn PDF document text
    • http://westchesterwebsitedesign.com/uploads/1/3/1/4/131438241/bitilaxovodi.pdfIn PDF document text
    • http://74-123-78-122.mgwnet.com/uploads/1/3/0/8/130813429/rewosa.pdfIn PDF document text
    • http://boekinbinding.nl/uploads/1/3/0/4/130494389/sexoduve.pdfIn PDF document text
    • http://natureguidetrainingbotswana.com/uploads/1/3/0/6/130621500/4172758.pdfIn PDF document text
    • http://allstartechnologies.net/uploads/1/3/0/9/130969595/8617113.pdfIn PDF document text
    • http://shaneglasson.com/uploads/1/3/1/4/131437535/tuguxikubawiveratu.pdfIn PDF document text
    • http://jorgerivera.art/uploads/1/3/0/4/130435722/lolidasodarirepefij.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
🗂 Part of campaign: costassolutions.com 3 samples

Related samples 2

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_off00005e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E55 8272 bytes
SHA-256: c94ea3355fd2f539cf36793ce1bca5efe6cd84b8f5a4638251d5946ff1c81647

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