Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4fc5a573cca7e4…

MALICIOUS

PDF

72.7 KB Created: 2021-02-27 19:14:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 6d294c7dd119bbe79a9711b7da975611 SHA-1: 9206fb8cb78d2e53745ab127aa789ece062075f0 SHA-256: ef4fc5a573cca7e487e5d486fcfe12eae5c51426391a4c5509afb8fe2639b4dd
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=sony+icd-px440+specs PDF link annotation
    • http://totumaxotudi.iblogger.org/sasoliwaxukife.pdfIn PDF document text
    • http://redtea.space/gezupupebuzunupitudevuwopb836r.pdfIn PDF document text
    • http://fanutoragozogow.sportsontheweb.net/what_causes_a_dishwasher_to_not_clean_well.pdfIn PDF document text
    • http://dmdmassage.com/autocad_2015_3d_tutorial_free7ae5q.pdfIn PDF document text
    • http://yblda.fun/types_of_mood_in_mental_status_examfnl9f.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/2411964619.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/14828910118.pdfIn PDF document text
    • https://cdn.sqhk.co/tilamasepi/gcibGgc/gravity_rider_zero_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/xYhcibU/space_crew_xbox_cheats.pdfIn PDF document text
    • http://tugrull.com/what_is_the_best_front_load_washer_brandoyjts.pdfIn PDF document text
    • https://cdn.sqhk.co/somepizeko/cPnh0ZG/xujapetawufimeseli.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/stairway_to_heaven_bass_guitar_pro_tab.pdfIn PDF document text
    • http://webpost.pro/how_many_awards_has_gary_paulsen_won3tful.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/fcja2ia/penguin_run_2_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/iXvrhdv/20316917842.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/divibezenafoxifi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livirava.atwebpages.com/honda_eu6500is_battery_charging.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_off0000dcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 5264 bytes
SHA-256: 18422eaae385b1ebbdef18811bd6671dcebaa82f1bea8ebcbd86c58605477f7f
font_01_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 12024 bytes
SHA-256: eadf3b3e9b7bd7a16e7574f79fc8697e2a1b14ddf044845f36fdde6e18f2b1d9

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