Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cd3b691888cd79…

MALICIOUS

PDF

75.3 KB Created: 2021-02-26 17:14:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 4083f27c6a9ad00645878b804864bc71 SHA-1: 29c935d0b0b3121bb3896ed8b7de9b6c4d26b1a0 SHA-256: 16cd3b691888cd794c0ddf62661a63f2169da4e34ad64f8b40b087522f2f7bfc
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 flagged by multiple heuristics, including a high-severity 'PDF_SEO_UTM_REDIRECTOR_LINK' rule, indicating it uses an image lure to redirect users to a phishing site. The ML classifier and ClamAV also identified it as malicious. The primary IOC is the redirector URL, which is likely used to host a phishing page or download further malware.

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://xezojetit.ru/award?keyword=schwinn+sidewinder+21+speed PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490264/normal_601edba695c40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464534/normal_5feec4bcb11a0.pdfIn PDF document text
    • http://lizakoku.22web.org/performance_assessment_comments.pdfIn PDF document text
    • http://nefuzixitelu.iblogger.org/26214185189.pdfIn PDF document text
    • http://899themes-demo.ru/jijasopedokimewq9q3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496586/normal_602793fb4c700.pdfIn PDF document text
    • http://shoplus.info/vivawudijelagudfp3un.pdfIn PDF document text
    • http://fineagencyy.com/37143129627muzwa.pdfIn PDF document text
    • http://yoptan.space/469610150693g3m6.pdfIn PDF document text
    • http://nafugelinev.iblogger.org/34258270384.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/legenapi/academic_performance_of_students_with_hearing_impairment.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/70759011869.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/fidekexolosibotusekon.pdfIn PDF document text
    • http://nivajunupoz.epizy.com/minority_report_movie_480p_dual_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/billionaire_casino_cheats_android.pdfIn PDF document text
    • http://xiluwudikipo.epizy.com/52842255481.pdfIn PDF document text
    • http://nidemavaguwagev.rf.gd/87210463819.pdfIn PDF document text
    • http://zusatixolapurir.epizy.com/11607269191.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_off0000eaa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA9 5296 bytes
SHA-256: 61e14c26320bccabda092a10a409e81a6a7b1932a676b065e8d908a5ce7036e7
font_01_sfnt_off0000fcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 10336 bytes
SHA-256: 4e8cde77b58e9725aef2244192a537471699bfe34d31733cbe58a0ebd0fede0a

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