Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef38ff0d68ffb19f…

MALICIOUS

PDF

76.8 KB Created: 2021-02-23 14:00:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3cddb4c2d2d386bd090f81ad0c2b0a56 SHA-1: b68a379c8405b1bd1dafc9ece893abfcfd902164 SHA-256: ef38ff0d68ffb19f6844dbf411eb6775030465cf95526398492cd78d460290a9
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a high-severity heuristic indicating an image lure linking to an SEO redirector, specifically the URL https://jacksth.ru/wix?keyword=tv+guide+arlington+va. This suggests the document is designed to trick users into clicking the link, likely leading to a phishing page or malware download.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/wix?keyword=tv+guide+arlington+va PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404308/normal_5fe31bf521a94.pdfIn PDF document text
    • http://agentsoft.space/85587946353y0sx1.pdfIn PDF document text
    • http://tells.fun/fejiwimixojij0w5m5.pdfIn PDF document text
    • http://vvinorama.fun/validedoj36up8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425924/normal_5fccdef753237.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366976/normal_5fff6941dd078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392207/normal_5fe7d1bb90609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494435/normal_5fda3f1361c90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_5fe6dd37f3b1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450042/normal_60000dcc6ea83.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/Xhhchb6/like_a_wrecking_ball_piano_chords.pdfIn PDF document text
    • http://bonifacy.site/36567212278rqd9y.pdfIn PDF document text
    • https://cdn.sqhk.co/rakujolo/74mrPIS/forgotten_realms_map_high_res.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/gcXidss/voice_changer_sound_like_a_girl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sulezunabifop.epizy.com/60542054009.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 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_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 4704 bytes
SHA-256: 3e3564c27b7273b2044eab268112566fcacbb6311113e8d4cf25326906a92d28
font_01_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 10788 bytes
SHA-256: ca4723af1a5ac9044a7b0d08dc8dd807e243892b63bb00e3cddb4812c11c1f6e
font_02_sfnt_off000117ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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