Malicious PDF — malware analysis report

Static analysis result for SHA-256 7523f1b17c59261a…

MALICIOUS

PDF

70.7 KB Created: 2021-02-14 07:21:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 4da0a50bea9d2336ca8c3ade3d3e78f8 SHA-1: 48edc5f1c7b286a0e614df2384115476c3c8558e SHA-256: 7523f1b17c59261ada15be811812bff755bf2543aebef8e9899e2587a6a53fb9
136 Risk Score

Malware Insights

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

The PDF contains a high-confidence heuristic indicating it is a phishing lure, specifically designed to trick users into downloading a file. The embedded URL, 'https://leonvi.ru/123?utm_term=5th+grade+social+studies+book+answers', is presented as a link to educational content but functions as a redirector to a malicious payload. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', further confirming its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=5th+grade+social+studies+book+answers PDF link annotation
    • https://cdn.sqhk.co/posiraki/gi85hhS/best_video_recorder_app_for_laptop.pdfIn PDF document text
    • https://cdn.sqhk.co/dadakafopina/R0K9Zb5/monstera_plant_leaf_brown.pdfIn PDF document text
    • http://artistichomesolutions.com/ralupojunotuzu755ep.pdfIn PDF document text
    • http://vabapagamowese.22web.org/new_movies_free_in_telugu.pdfIn PDF document text
    • http://itgermany.net/aix_en_bus_ligne_6mh5b5.pdfIn PDF document text
    • https://cdn.sqhk.co/pemanunid/hdegfj9/pefefidogalarigusabijat.pdfIn PDF document text
    • http://1fps.ru/b1_english_reading_textsmc494.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rolexewosuvasu.epizy.com/wagonijonez.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/44681466276.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/19524713551.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/laravel_email_template_builder.pdfIn PDF document text
    • http://gipapexof.rf.gd/pajidimekose.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/taredevojaxox.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_off0000d889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD889 5524 bytes
SHA-256: 7db814c255c1997d80e6a2210b0a9b6ae5ceec1db9346196cfbc73be30a88696
font_01_sfnt_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 10128 bytes
SHA-256: 333d5cb9f8d161646686d118b3ca7e1066d5189db1b2c98d77226fccdfee9a2d

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