Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace8523d4425e6ff…

MALICIOUS

PDF

71.2 KB Created: 2021-02-10 23:26:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 2700ebc6d9d9d8d33fa13f68af4d6c56 SHA-1: 6e2ff7a0f5dc03cebbdd6eecd065fe9bca06b5d3 SHA-256: ace8523d4425e6ffbd9ef788cb1d8ed1ac116987b7674432475db55f8c89028f
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a lure related to 'determining relative age worksheet 63 answers' and embeds a URL that redirects to 'https://bologen.ru/123?utm_term=determining+relative+age+worksheet+63+answers'. This URL is likely used to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=determining+relative+age+worksheet+63+answers PDF link annotation
    • https://cdn.sqhk.co/mejabutumu/ch7gihb/fositajenivisi.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/z3idjiK/head_ball_soccer_2018_19.pdfIn PDF document text
    • https://cdn.sqhk.co/tarekekog/jjf1tge/musica_de_los_80_y_90_descargar.pdfIn PDF document text
    • https://cdn.sqhk.co/xonoguduzob/Wu1jjjd/novomagifisetan.pdfIn PDF document text
    • http://skout.tech/allusion_in_the_gift_of_the_magi9atuy.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/3njdjqp/murigevudikemukovixuxix.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/ie8rx3x/wings_financial_apple_valley_hours.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470218/normal_5fdc5cda295e2.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/921gcif/world_cup_2018_results_brazil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486772/normal_6013a16a48510.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/gC4jdgd/voderajigipexeleseserure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390681/normal_5fed39c8c72a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fc62df02f1f4.pdfIn PDF document text
    • https://cdn.sqhk.co/matezafun/3vhbq6O/6502828188.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/Khh8jgf/lowe_s_hours_on_easter_sunday.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nubuwij.epizy.com/malowiruzixulemik.pdfIn PDF document text
    • http://zabukek.rf.gd/algebraic_fractions_worksheets_tes.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_off0000d797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 5632 bytes
SHA-256: 8724705f289ea3f082b8104ef6a36f65ec9dc3d3f4fe5e1963efb428ff9d9dda
font_01_sfnt_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 10364 bytes
SHA-256: 5f00fbee78f535fa1adab751922caf00231be20bcf2c64c15f9a4ed0dc81ba6e

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