Malicious PDF — malware analysis report

Static analysis result for SHA-256 27de607b1bcf1bf1…

MALICIOUS

PDF

80.1 KB Created: 2021-01-17 22:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: a32aafe53c74b70c605a9882c722777f SHA-1: 083d7996b6058a3b36030938949b80abfa54f007 SHA-256: 27de607b1bcf1bf10a595d3680e2fa76329e64db695a0c3d28438629d85dc5ab
194 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 multiple heuristics, including a critical alert for a redirector link and a high ML score. The embedded URL points to a known malicious redirector, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'Kosaraju's algorithm proof', likely serving as a lure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=kosaraju%2527s+algorithm+proof In PDF document text
    • https://cdn-cms.f-static.net/uploads/4472776/normal_5fe9024babe94.pdfIn PDF document text
    • https://cdn.sqhk.co/kekumumaxow/1ijigrE/106249121.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/hgibibB/adventures_of_brer_rabbit_book.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/hiyjgXU/the_whipping_boy_summary_chapter_by_chapter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453553/normal_5fd09a7d9dcd0.pdfIn PDF document text
    • https://site-1249158.mozfiles.com/files/1249158/ruliwobujuzizifijafe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462697/normal_6000f2964280b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365657/normal_5ffb505f87d96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465565/normal_5ff54d395c9d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5fc487fb09877.pdfIn PDF document text
    • https://site-1171694.mozfiles.com/files/1171694/the_banner_saga_3_ios.pdfIn PDF document text
    • https://site-1168194.mozfiles.com/files/1168194/tricky_beer_pong_challenges_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500444/normal_5fab8951858e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408987/normal_5fe690c02458d.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/jFgduib/weather_forecast_for_albany_new_york_tomorrow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425501/normal_5fc36d2478777.pdfIn PDF document text
    • https://cdn.sqhk.co/gidufulelav/fieY3eA/bollywood_2019_mp3_songs_downloadming._sx.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://boponewutizubi.rf.gd/tosowetawedasikazolufim.pdfIn PDF document text
    • http://pumusejori.epizy.com/amar_ujala_news_paper_today.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_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 5052 bytes
SHA-256: aa51210312cd05cb76ea97ead1850ce600a807d08210c89acf171b491cff176a
font_01_sfnt_off0000fef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF3 11112 bytes
SHA-256: ee7bcddd5a03205b6bdaf2fbfe08a8f6c6d4c19ca431b4d64f93fa8c622b9b72
font_02_sfnt_off0001252e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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