Malicious PDF — malware analysis report

Static analysis result for SHA-256 b451d6fb6dc0b9c9…

MALICIOUS

PDF

77.2 KB Created: 2021-02-10 07:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: c2da4b30d54be606091b4dc55d523632 SHA-1: 0cf56a84def828395b9d826f2c653f737ddd7ae4 SHA-256: b451d6fb6dc0b9c924b1ea64fa84cff8fd9efa18bce1ec12ae8564bf4f7f6e37
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it's a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary IOC is the redirector URL, which is likely used to serve a second-stage payload.

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/aws?utm_term=aptitude+questions+pdf+with+solutions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367268/normal_6022dedfe42c6.pdfIn PDF document text
    • http://wolorarozuxa.22web.org/drdo_internship_report.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/GcgihbG/doomsday_preppers_survival_kit.pdfIn PDF document text
    • http://deruvakibifazo.iblogger.org/mewufixebur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473916/normal_601c85bb93a33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420260/normal_60055e433f3ce.pdfIn PDF document text
    • https://cdn.sqhk.co/jenojigise/ie8hbge/call_pakistan_for_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/jjf4jgP/tevamelisapezivoxujirula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_60194d98314cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fikirifulok.epizy.com/furuligovapisamem.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/kodapilakatofiwuzeke.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/computer_networking_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/esl_stress_and_intonation_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/berg_balance_scale_test.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/kakelaraged.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/12361289958.pdfIn PDF document text
    • http://kovusilo.epizy.com/31341220562.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/lilosetalodedi.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/64639232278.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_off0000ecc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 5032 bytes
SHA-256: e21405ae2dc16eb877aae621e7492c261476ad9f770c0e9e09f1eefecb1de2a1
font_01_sfnt_off0000fdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFA 12720 bytes
SHA-256: 5a4ef46a25d5cdf23e741c82b8511d7b85ae61c7f03b29f263c54ddf7e525b54

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