Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a8caf199599b1a…

MALICIOUS

PDF

70.9 KB Created: 2021-09-13 23:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 076e06099fcf50a4bfedeb7555276395 SHA-1: 664df3a094bf132b9256419b7da379edf490ac7b SHA-256: 76a8caf199599b1a0a72254b67b4872c93d579a290c03051c317e69877b86192
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vino-charlie.cz/userfiles/file/nabezo.pdf In PDF document text
    • http://daieimotors.com/js/upload/files/93784560364.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/momebosigu.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/10501099218.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/1084978949.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/livajefabunomowipufuxopod.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/9712633259.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/37937504559.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/lazuputarosaniruvavununu.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/92133295073.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/jizugila.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/mabuputavu.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/wafumubebovodomuwij.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/vatukikiselujadetiv.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/kuduzax.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/mediruverenijitiluduvit.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/55828357009.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/zoxigalakebetenas.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/nutebiralelesesaw.pdfIn PDF document text
    • http://cichanski.com/Upload/file/batemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=slowmo+smooth+mod+apkPDF link annotation
    • https://mediaget.com/userfiles/files/bovudow.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB485 10484 bytes
SHA-256: ba45146937ace8cc0c20d13f0fa94baad13ea27fbfd349ab8ff712d1c09f1eb7
font_01_sfnt_off0000cc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC67 16436 bytes
SHA-256: d50420f58ea9e7bfd12ff4621eca036a739f21ecc58cd509f12f978f1bf51fc9
font_02_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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