Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b870556ba1c90db…

MALICIOUS

PDF

44.0 KB Created: 2020-04-03 13:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: bf9dc51621877e24b8d32503156dee2b SHA-1: d88dec423beba372238ab1cb9e1285ba8abe929c SHA-256: 4b870556ba1c90db43ca52b68cc22fee5fdea930396c8b8a6b115de7ec6c7c65
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, contains text related to a dictionary and the wkhtmltopdf application, suggesting a lure. The primary attack pattern involves directing users to a link farm, likely for SEO poisoning or to distribute further malicious content. No scripts were extracted from this sample.

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://peakathleticsystems.com/uploads/1/3/1/4/131453174/131453174.html#dicionario+portugues+ingles+online+gratis PDF link annotation
    • http://brettmgearing.com/uploads/1/3/0/4/130483300/mepuxike.pdfIn PDF document text
    • http://lynnhawthorneart.com/uploads/1/3/0/5/130588849/gifilomoruboz.pdfIn PDF document text
    • http://faithworkscrc.org/uploads/1/3/0/6/130620759/retexumorusosoxoji.pdfIn PDF document text
    • http://destinyusaleggings.com/uploads/1/3/0/5/130547728/f5cba7b217e705.pdfIn PDF document text
    • http://hostmaster.thelaughingsole.org.uk/uploads/1/3/1/0/131070170/4667673.pdfIn PDF document text
    • http://simplycorkie.com/uploads/1/3/0/7/130775698/39b6b.pdfIn PDF document text
    • http://nontraditionaldesign.com/uploads/1/3/0/7/130739682/ledijuvewelo_welisaze.pdfIn PDF document text
    • http://thearcmc.org/uploads/1/3/0/6/130621601/nafajad-busivomubigefi-vidomabad-dubewenadepu.pdfIn PDF document text
    • http://nau-systems.com/uploads/1/3/0/5/130539702/f417d4dce1b038.pdfIn PDF document text
    • http://carolynsandstrom.com/uploads/1/3/0/4/130488786/718005.pdfIn PDF document text
    • http://leslie.tax/uploads/1/3/0/7/130776363/8519528.pdfIn PDF document text
    • http://clearbrookorchestra.org/uploads/1/3/0/5/130588714/73ed39c8.pdfIn PDF document text
    • http://built1776.com/uploads/1/3/0/6/130605344/11ec2.pdfIn PDF document text
    • http://valleyviewacrespnw.com/uploads/1/3/0/7/130776587/rasowi_wovurojiwej_wiwatage_turaji.pdfIn PDF document text
    • http://escort-1001.de/uploads/1/3/0/6/130639853/50ec828f1f.pdfIn PDF document text
    • http://discourse-x.com/uploads/1/3/0/7/130739533/jivopur_kolikepukab.pdfIn PDF document text
    • http://dymproductions.com/uploads/1/3/0/6/130620885/suvesase.pdfIn PDF document text
    • http://streetsidepaws.com/uploads/1/3/0/8/130874610/jezotow-sifuvo-vikodifadilaxin-zeneteveguri.pdfIn PDF document text
    • http://hostmaster.improvemywifi.co.uk/uploads/1/3/0/7/130775588/8396068.pdfIn PDF document text
    • http://maureenseebastudios.com/uploads/1/3/0/5/130544191/lukivagazebusatedu.pdfIn PDF document text
    • http://hartsnursery.net/uploads/1/3/1/4/131484090/depitedu-jemuvaxegevet-duvite.pdfIn PDF document text
    • http://playpokeronlineforrealmoney.com/uploads/1/3/0/2/130270982/18d7a16636.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7488 10216 bytes
SHA-256: 250dd70c7d1aa2ad4198c710dee3dd46da4a92e38dd950307231fe0491c841aa
font_01_sfnt_off00009686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9686 2652 bytes
SHA-256: e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc

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