Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a13fbf7aca4e663…

MALICIOUS

PDF

78.7 KB Created: 2021-02-09 20:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 53002de4b5fe95ca4a73ea84e9545eef SHA-1: 52ab204cf3a090f2d33ae11ecfc5f0e8a0f52f87 SHA-256: 4a13fbf7aca4e663ce2ea0a7ff66afcfdc2ec391260b63934a87ceeb17bf898c
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple heuristics indicating it is a malicious redirector, specifically designed for phishing lures. The embedded URL `https://yafferge.ru/123?utm_term=kernelsphere+technologies+unlimited` is flagged as malicious and part of a phishing scheme. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the primary attack vector appears to be a user-driven click on a malicious link within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://yafferge.ru/123?utm_term=kernelsphere+technologies+unlimited In PDF document text
    • https://cdn-cms.f-static.net/uploads/4472503/normal_60225967edbe8.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/hashdkx/fupedugixif.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/ufjbgdM/500_words_2019_winners_stories.pdfIn PDF document text
    • http://alphabitx.com/gardenia_malaysia_annual_report_2018blsmw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411493/normal_600dff29118c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405950/normal_5fe6962f596c1.pdfIn PDF document text
    • https://cdn.sqhk.co/ropimipaf/liafzut/jusujo.pdfIn PDF document text
    • http://burrrhey.tech/xodadunu0cad9.pdfIn PDF document text
    • http://itali-big.space/full_form_of_dpa2fysf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389604/normal_5fe3bff399636.pdfIn PDF document text
    • http://reduslimitalia.site/bls_student_manual_20152ch1j.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/Mgd6giW/change_eye_color_surgery_cost.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/la_rafle_download_fr3drrd.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/kovilowab/aluminium_sheet_cost_per_kg.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/dvdvilla_hollywood_movies_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/microsoft_excel_ledger_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/camera_app_blur_background_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/ags_algebra_2.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/mojijolesomonekawumik.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/best_fb_auto_liker_apk_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/stranded_isle_game_guide.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_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 5244 bytes
SHA-256: 2bb55d1299d14f00c6b1cdfdc2e1647bcee739a4d7a06ea38d74728539cffa63
font_01_sfnt_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 11300 bytes
SHA-256: dcca3d31003d550d93d037d69483d8e7a1956f83e6adffffd29480ab3ffb6fd2

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