Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bff53131e7bf105…

MALICIOUS

PDF

76.7 KB Created: 2021-03-13 14:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9d11095da209db7845e6e6ef5fde1574 SHA-1: 7bdad85e3249901482668d7662a714b006e24974 SHA-256: 4bff53131e7bf105e388e6b0a7b6cae29fc2dbaff4d4b3c3caeb5970a1005d47
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-severity rule indicating it is an image lure linking to an SEO redirector for free-download phishing. The ML classifier and ClamAV also identified it as malicious. The primary IOC is the redirector URL, which likely leads to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=origins+the+journey+of+humankind+episode+3+of+8 PDF link annotation
    • http://suvonenexazu.mywebcommunity.org/c._s._lewis_screwtape_letters.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/bfrjahj/descargar_counter_terrorist_2_gun_strike_hackeado.pdfIn PDF document text
    • https://cdn.sqhk.co/kewexezaviz/nhichbg/vimabedokezura.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/the_boyfriend_list_e_lockhart.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/wubesakegezixozal.pdfIn PDF document text
    • http://lamanixumerad.mypressonline.com/samsung_galaxy_tablet_model_gt-p3113ts.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/45671192990.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/83904520064.pdfIn PDF document text
    • http://ruwazumusef.scienceontheweb.net/79891058557.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/tratamiento_para_anemia_megaloblastica.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/casio_5081_analog_time_set.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/iajejhh/vitamin_c_foods_for_skin.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/best_game_maker_studio_2_tutorials.pdfIn PDF document text
    • http://rozogididibusar.sportsontheweb.net/gujajalibozulesevonono.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/black_and_decker_grass_hog_trimmer_head.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/ceratitis_capitata.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6017e2e3-6d10-4d68-85a4-c7993e17ec8a/q-see_qt_view_pc_download.pdfIn PDF document text
    • http://bajekixizosi.myartsonline.com/free_kabbalah_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4990c9a-5ce1-40ae-8a04-3ef229e97d53/guwozusaneka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf05e46a-1d4f-4681-8f5d-e3c84f5369b3/luxipiriwuvapijuzutute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79ec2b57-6fcc-4603-b485-3a5a29fc243b/mugupirisibekake.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 6052 bytes
SHA-256: b1625709dde8b1b65706c4b15405b0d0d1d158e3998d9777676dda607fecfdbd
font_01_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 11076 bytes
SHA-256: 3fd70fd717478b023a03c0593656f283bf274aa7a9de222ab578b55b4ede9459

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