Malicious PDF — malware analysis report

Static analysis result for SHA-256 683ebc3e12412c0e…

MALICIOUS

PDF

69.7 KB Created: 2021-02-19 08:50:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c84118c12778e4ccc694e2a04e06f074 SHA-1: 71498327fe24ea2029ffbd84b44364c5efa89384 SHA-256: 683ebc3e12412c0ecc8671a195dcdf62d495724a9cccd5c661b1179ad2aabb28
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with the primary one being https://leonvi.ru/123?utm_term=using+r+with+multivariate+statistics+randall+pdf, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/123?utm_term=using+r+with+multivariate+statistics+randall+pdf PDF link annotation
    • https://cdn.sqhk.co/bowewulaxam/5ifgvD2/xagegipexokaxoneponubus.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/61LjjjY/nuvemogefiviti.pdfIn PDF document text
    • https://cdn.sqhk.co/samivegin/SnHSFfw/nugij.pdfIn PDF document text
    • http://littlenat.space/download_toca_life_school_mod_apk4hd7v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427499/normal_5fedf6c1977a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490001/normal_600bfd2e9eb40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419851/normal_602a8ee69bc1b.pdfIn PDF document text
    • https://cdn.sqhk.co/woxekivepi/cLhgX0Y/dodurataduv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465125/normal_5fee2d0b9efa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481173/normal_5ffb5a5dea9ef.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/Fgfhehe/beholder_indy_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/ia4hbf4/alone_season_7_winner_spoiler.pdfIn PDF document text
    • https://cdn.sqhk.co/madeparev/Bhcwfjt/woziputo.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/duPjfoK/48549508302.pdfIn PDF document text
    • http://reduslim-buy.site/guides_canada_logobfybo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fd868d8d3ede.pdfIn PDF document text
    • http://akvatehnika74.ru/saint_seiya_awakening_hack_apkwsibv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384030/normal_5fd828b9a38ef.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/wenobagupexekap/91390052727.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_off0000d002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD002 5712 bytes
SHA-256: 73a34dd7f0a8a733d178a537958874586ecf77abc1d0eb8e2ccf96a9f786de91
font_01_sfnt_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 11184 bytes
SHA-256: 536d8d87901dcc014df8fb22f9ab76fc89c2014b358c0e26e0c654acc5c5bf8a

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