Malicious PDF — malware analysis report

Static analysis result for SHA-256 81058b8d7d38c2f7…

MALICIOUS

PDF

78.8 KB Created: 2021-01-24 17:27:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 8eaa8c837933478bec0096b139a000bd SHA-1: 03a187f66c7a7bb10abf5cb7134532622aa372fe SHA-256: 81058b8d7d38c2f765c33b67de037a2d22fc27b9ef757299001b396941586285
76 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it's a lure for phishing or malware distribution, redirecting users to a suspicious URL. The ML classifier strongly supports its malicious nature. While no scripts were explicitly extracted, the embedded URLs and the nature of the heuristics suggest an attempt to trick the user into visiting a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://leonvi.ru/123?utm_term=anchor+bible+dictionary+online+pdf PDF link annotation
    • http://studyweb.site/no_limits_race_to_sunsetzshuv.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/t_mobile_high_speed_home_internetkg9tm.pdfIn PDF document text
    • http://duxogesubuz.22web.org/pedolitikitipetexoru.pdfIn PDF document text
    • http://digitalmicroteter.xyz/joxuli7dj6i.pdfIn PDF document text
    • http://discount50.pro/vexakuweyt86d.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/iphone_x_max_ringtones_free_downloadhiect.pdfIn PDF document text
    • http://rezltml.xyz/korimabomasidezurolowusuaokr.pdfIn PDF document text
    • http://mybiol.site/best_free_call_blocker_app_for_android_2020dlf46.pdfIn PDF document text
    • http://shop-kid-toys.online/the_new_gate_schnee_and_shinfmkbv.pdfIn PDF document text
    • http://bloomwithdeanna.com/brawl_stars_opening_1000_mega_boxesasxcr.pdfIn PDF document text
    • http://igme.site/946795582032nedx.pdfIn PDF document text
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/2597358.pdfIn PDF document text
    • http://womans30planet.com/25352174662tolsk.pdfIn PDF document text
    • http://rmk4sale.xyz/love_glitter_full_hd_wallpaper1p6gu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/satuja/alta_performance_pessoal.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/cycle_time_study_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/gebupifabineraxa.pdfIn PDF document text
    • http://dofomexikokubeb.epizy.com/boggle_generator_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/38356687369.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 5084 bytes
SHA-256: 5150f8d60bc7a6b51602c52d5c0b0ddb313ebefca79b16aaafb5fb6ff71abcad
font_01_sfnt_off0000fdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 10060 bytes
SHA-256: 4f3f098ec31c8cee51b9b909af006cb6d36165babc6e7870f13a7ecf54cc1106
font_02_sfnt_off0001201f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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