Malicious PDF — malware analysis report

Static analysis result for SHA-256 4457d0a8b37e60e0…

MALICIOUS

PDF

71.8 KB Created: 2021-02-06 20:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-12
MD5: d977ff863bdda49679b89e453177f4ec SHA-1: 7f88084eef1a29543f44eb282b07883385045d3e SHA-256: 4457d0a8b37e60e03b199fa55d781df6221f2b9e630d52d990363633b0eb813a
194 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to a known malicious URL, identified by heuristics as a redirector for phishing or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to academic formatting, likely to trick users into clicking the malicious link.

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://crophysi.ru/wb?keyword=reference%20page%20apa%20format%206th%20edition%20example In PDF document text
    • https://cdn.sqhk.co/rebiguta/q0jbhgk/sitigav.pdfIn PDF document text
    • https://zikawudewodag.weebly.com/uploads/1/3/4/5/134585044/6ebcbdfd7c64e2.pdfIn PDF document text
    • http://supermagazforsale1.xyz/50874139644twk6.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopivosoba/ggRjhMD/elunevision_reference_4k_screen_review.pdfIn PDF document text
    • http://ubzvp.com/85070092993kgatc.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/DPhhnFf/newen.pdfIn PDF document text
    • https://kekugijofer.weebly.com/uploads/1/3/5/3/135321092/bekivosakuk.pdfIn PDF document text
    • https://rigivopamakor.weebly.com/uploads/1/3/4/8/134869382/6511b3f769.pdfIn PDF document text
    • http://storeplus.pro/arabic_alphabet_in_different_formsf1uc4.pdfIn PDF document text
    • http://xofenejilomoz.iblogger.org/56031224044.pdfIn PDF document text
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/fukapixumigabefeweta.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/bupaxomu/al_madina_newspaper.pdfIn PDF document text
    • http://safadixuzet.rf.gd/lidajogemodamiru.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/bulgaria_visa_form_india.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/chiari_malformation_uk_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/comparing_and_ordering_fractions_worksheets_year_6.pdfIn PDF document text
    • http://bodufusuviv.epizy.com/kukepirutalilemo.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_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 5620 bytes
SHA-256: 5d256297fa3fe48df8b227241ab188ebbf183eac722b1a295008f41ff320152d
font_01_sfnt_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 10812 bytes
SHA-256: c2c501af5e21c7a0235a9e6c5de59f0535538b5c745532fe448c34f57d00d741

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