Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51dd1e2e2747f93…

MALICIOUS

PDF

75.6 KB Created: 2021-02-12 14:05:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 21ac5b395728ad1b32111681758bd605 SHA-1: c5d9876e00b2f192c7e87873142f45deab02ed5b SHA-256: b51dd1e2e2747f939c41d734ed036249242dff697e84db86fb89cffd2f35e7ac
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it's a phishing lure, specifically using an SEO redirector to disguise a free download. The embedded URL points to a suspicious domain, likely serving as a gateway to malicious content. ML and ClamAV detections further confirm its malicious nature.

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://jottigo.ru/wix?keyword=chemical+bonding+questions+and+answers+pdf+class+11 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462339/normal_5ffa8bab822e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_5fe79977d9454.pdfIn PDF document text
    • https://cdn.sqhk.co/vetesomiw/jhplMGU/snakes_and_ladders_online_dice.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473963/normal_6021a2d8f198f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409797/normal_60067eb89f64d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489058/normal_5fec7016cb8eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379234/normal_5fe19b5f11556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_5fd15d49d831a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_6016d5e995b76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483362/normal_600d8de90ce4d.pdfIn PDF document text
    • https://cdn.sqhk.co/zexetiminav/TiiR0ia/79385472665.pdfIn PDF document text
    • http://sarilaruzez.iblogger.org/xabazowarowumagisup.pdfIn PDF document text
    • https://cdn.sqhk.co/fezivabuja/jgFhce9/fujubuwidafasejukipulu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lidiwerefibe.rf.gd/46737384308.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/78579514716.pdfIn PDF document text
    • http://dolumuvi.rf.gd/swept_away_christopher_cross_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/lijanarenuparemilis.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/pan_card_online_nsdl.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/argus_c4_camera_manual.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_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 5884 bytes
SHA-256: 9b09292e1df69194d1fcd69f716f13168129a73639448572404f79b88923ef6b
font_01_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 11108 bytes
SHA-256: b31ee590c490c93a1b025fe7543647786819751bf268f167d224799b3d13db3d

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