Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b9424c56c9d255…

MALICIOUS

PDF

68.4 KB Created: 2020-11-11 21:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3314ef994923c576c42852985ab81f19 SHA-1: 9242002a44c6087b37f86e0cb6c5d285e708d8ae SHA-256: 79b9424c56c9d2553416c515d20d919474833f77f23d8c129ea0c1b9c5722c34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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 https://trafffe.ru/123?utm_term=irish+pop+culture PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414339/normal_5f9539e729a5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371240/normal_5f93455c3f938.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/2171885.pdfIn PDF document text
    • https://somafixuwase.weebly.com/uploads/1/3/4/6/134605374/591189.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/loneminovu/owners_manual_2015_hyundai_sonata.pdfIn PDF document text
    • https://s3.amazonaws.com/sodoxi/zapomebekegigexerida.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/free_movies_download_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/malayalam_movie_online.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/gifobiritopegisuk.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/artificial_intelligence_tutorialspoint_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/proteinuria_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/11437677167.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9F 4748 bytes
SHA-256: 462f04694e4727a19d1f34218fd6f95e0f6910c529d27d74579d4d63378085cd
font_01_sfnt_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 10828 bytes
SHA-256: e86ba85c55d55cca222520e28698fc5c1b00afa767d0fdb489b48b8b57f986c0