Malicious PDF — malware analysis report

Static analysis result for SHA-256 841e1cb77f78e1e0…

MALICIOUS

PDF

69.1 KB Created: 2021-02-21 03:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 0076b9b5e191e56f0072cf81efc510b8 SHA-1: 71c9cda070825eaa4421d8323737f230a0f88ec9 SHA-256: 841e1cb77f78e1e077a2447e8d6551d595d1d0b0c44dbeee526fed82f9d7216e
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a lure for a free download of a surgical textbook, which redirects to a suspicious URL. The presence of a download button heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=pretest+surgery+13th+edition+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/wadalibituge/hjB0hd7/lupojajugitozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383147/normal_5fe81f1a2fe2f.pdfIn PDF document text
    • http://zagufupilafuw.iblogger.org/jexemuzulexekedovipe.pdfIn PDF document text
    • http://reform-st.ru/vuxidetuvetitisamomuoqx6g.pdfIn PDF document text
    • http://hurleyshamburgers.com/265755233105361r.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/1jgii6i/96219502883.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374360/normal_5fcd6ede68cbc.pdfIn PDF document text
    • https://cdn.sqhk.co/nefijisob/icibjin/clue_game_online_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500453/normal_5fc7d78b48727.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/dejolavubukugeb/ffxiv_shadowbringers_job_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/gonexodutalepewipigesen.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/zutosotumesegegitarojeta.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_off0000ced1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED1 5712 bytes
SHA-256: c55bd661ac88d73cb600d5b3f62b666b7ff41bf037ecd777c81d4b942bd27496
font_01_sfnt_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 10876 bytes
SHA-256: ce202a32e2c65a2fbdb71e35a5747aeab143091c530f5bac806a97799e9dc552

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