Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec20d41660f62347…

MALICIOUS

PDF

77.8 KB Created: 2021-02-22 12:31:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bca680f96663429f28de34fcb7d30ce1 SHA-1: baddcefa5a33fd97d6f68b5f974972ffe7f9db62 SHA-256: ec20d41660f623478ce398dbdb12de2954d4c02dbbaf3ddc39d42bb8298b5a09
136 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The presence of an SEO redirector URL, specifically 'https://jottigo.ru/123?utm_term=schwinn+a20+recumbent+bike+manual', indicates a phishing or malware distribution lure, likely disguised as a free download. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. No scripts were extracted, but the overall pattern suggests a phishing attempt to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/123?utm_term=schwinn+a20+recumbent+bike+manual PDF link annotation
    • https://cdn.sqhk.co/visesefider/mlidnLW/rokukusafujuzeweg.pdfIn PDF document text
    • http://hightrade.club/fimipikisaxijejqb7rr.pdfIn PDF document text
    • http://freshmind.net/pj_masks_hero_academia_freetryct.pdfIn PDF document text
    • https://cdn.sqhk.co/dufelogaruf/Jhi0ij5/japoz.pdfIn PDF document text
    • https://cdn.sqhk.co/nilimijano/XCChdmu/90925794688.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/chhajiG/sozitudajidil.pdfIn PDF document text
    • https://cdn.sqhk.co/riwutosax/sijPojc/dungeons_and_dragons_online_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/fTvgdTC/artificial_intelligence_movie_cast.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
    • https://s3.amazonaws.com/vutame/vuzupolotem.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/zomuxuwuwekizubol.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/how_much_should_the_average_person_make_a_year.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/comparative_superlative_adjectives_list.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/junapijuwusexutaxime.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/pajaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 5304 bytes
SHA-256: 7b9ef29b1e258e4364fb81a3bd65a2136325a0fde01f17c04817b1d39cceeb9c
font_01_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 10504 bytes
SHA-256: e7e0be1150cd366da7880b9e058c13537b5f0bc1954daedad8b68dc7eb71fde8
font_02_sfnt_off00011be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE9 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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