Malicious PDF — malware analysis report

Static analysis result for SHA-256 77af4fd0e4bdafe4…

MALICIOUS

PDF

70.9 KB Created: 2021-03-12 17:41:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cd07634549bf669d2cd58a1e93dc8409 SHA-1: a2d69177dbdc4ec8ce15aee7fde2ec661ac6a692 SHA-256: 77af4fd0e4bdafe4d590e0446c275beca21a2d7c6a84ef106f966fe3e9b9b0ad
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm hosted on disposable domains, with a high ML score for maliciousness. The document body, though partially garbled, suggests a lure related to 'worksheet answers'. The embedded URI points to a suspicious domain, likely serving as a landing page for phishing or malware. No scripts were extracted, but the overall structure and URI suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lozipotod.ru/wix?keyword=bigger+stronger+faster+video+worksheet+answers PDF link annotation
    • http://retys.space/the_green_mile_book_review_new_york_timesz6bq1.pdfIn PDF document text
    • http://gexulogoben.sportsontheweb.net/two_sides_of_effective_oral_communication.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/vumevugis.pdfIn PDF document text
    • http://pobesegu.scienceontheweb.net/how_to_reset_kenmore_washer_machine.pdfIn PDF document text
    • http://vizionsmc.net/rewrite_the_stars_sheet_music_pianoxsntv.pdfIn PDF document text
    • https://devivevapidon.weebly.com/uploads/1/3/4/7/134711806/2a0fb24a414467.pdfIn PDF document text
    • http://devgm.design/991682452250w1p8.pdfIn PDF document text
    • https://pumebogevi.weebly.com/uploads/1/3/4/5/134583518/8f89ead3b921f.pdfIn PDF document text
    • http://kimisorunutom.medianewsonline.com/causes_of_major_depression.pdfIn PDF document text
    • http://nubilofanekib.mygamesonline.org/livro_assertividade.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/jolunenafobuw/bhaijaan_cinema_video.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/83189279275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cd25ec5-9a96-4372-84a4-2f592bfed22a/vosedekivejipiboki.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/46307219707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/518874cd-3d56-42f6-80ee-798d390a0033/nufekuredigazobidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3b5efe-031e-41b8-aadf-fdaecdf8b392/72655222683.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/91972867088.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/mla_format_website_owl_purdue.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/22092975500.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_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 5404 bytes
SHA-256: f44fb574900feb870e20915f6428e9b2ee9e9d596d9cffd3a178fb9dc0a0c357
font_01_sfnt_off0000eabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABC 10368 bytes
SHA-256: 61cbd56a1f5dbc9846baec31379158d970f8924bffefbdc8292dd228f0c6f343

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