Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2166ea6ee24a41e…

MALICIOUS

PDF

37.8 KB Created: 2020-06-06 06:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 558aa1596f78f8389d1aa86b07907f30 SHA-1: 8dd0180c2d93ec9f011aa25ffdab5c2bff9ecf13 SHA-256: b2166ea6ee24a41eaefe82e85f1662256aef9edb7fad05784a0b261362ff51cc
136 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. These links point to various PDF files hosted on different domains, suggesting a tactic to manipulate search engine results or distribute malicious content. The document body, though heavily obfuscated, contains the title 'Women race and class' and references the wkhtmltopdf tool, indicating it was likely generated programmatically to host these links. No scripts were extracted from this sample.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://host197.carmichaelnl.com/uploads/1/3/0/8/130874067/130874067.html#women+race+and+class PDF link annotation
    • http://lightlinefiberopticservicesllc.com/uploads/1/3/0/6/130621721/629913.pdfIn PDF document text
    • http://group-keller.com/uploads/1/3/1/1/131164555/6288238.pdfIn PDF document text
    • http://nycpublishingco.com/uploads/1/3/0/2/130289778/rokuje.pdfIn PDF document text
    • http://queeries.ca/uploads/1/3/1/3/131380889/9405938.pdfIn PDF document text
    • http://momlikemine.org/uploads/1/3/0/5/130588482/bunemutel-fasixele.pdfIn PDF document text
    • http://the-narrow-path.net/uploads/1/3/0/4/130478110/393d699378cfb.pdfIn PDF document text
    • http://mx.hadiyanuriddin.com/uploads/1/3/1/6/131637362/1151257.pdfIn PDF document text
    • http://basicswitch.com/uploads/1/3/1/3/131383914/6234fd2b29.pdfIn PDF document text
    • http://cheaperthancab.com/uploads/1/3/1/3/131398285/05db5bf58f9c2.pdfIn PDF document text
    • http://athaliahrenee.com/uploads/1/3/0/6/130604049/wojubaladeduw_biruveguvog.pdfIn PDF document text
    • http://itsjusthemp.net/uploads/1/3/1/6/131606762/4375733.pdfIn PDF document text
    • http://harrisonburgrecklessdrivinglawyer.net/uploads/1/3/0/9/130969236/56cb49607400.pdfIn PDF document text
    • http://gestionandoconsultores.com/uploads/1/3/0/2/130271157/6920816.pdfIn PDF document text
    • http://deleswaonthebeat.com/uploads/1/3/0/7/130775758/guginogek.pdfIn PDF document text
    • http://host197.carmichaelnl.com/uploads/1/3/0/8/130874067/terms.htmlIn PDF document text
    • http://host197.carmichaelnl.com/uploads/1/3/0/8/130874067/dmca.htmlIn PDF document text
    • http://host197.carmichaelnl.com/uploads/1/3/0/8/130874067/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://kemujemurer.files.wordpress.com/2020/06/77798631030.pdfIn PDF document text
    • https://fatafujuk.files.wordpress.com/2020/06/70289576914.pdfIn PDF document text
    • https://sekaronokom.files.wordpress.com/2020/06/5020597744.pdfIn PDF document text
    • https://megelufebax.files.wordpress.com/2020/06/lulirogatadujixixejefu.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 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_off000069dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69DD 9860 bytes
SHA-256: 3c783653c82bfd1501aef72f710daddda849529c33bcfd043747f2fe1d90de6c

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