Malicious PDF — malware analysis report

Static analysis result for SHA-256 e443d255fbb76afd…

MALICIOUS

PDF

83.7 KB Created: 2021-03-17 13:18:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: eaae313c1466ae976ac8afb80b996069 SHA-1: 9b9375e7125e1dbd004dc8af365545b6e2ed78aa SHA-256: e443d255fbb76afd2e5648821e2e98f06bfea47cf46c15ed44a159589c3cd37c
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 numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to trick users into downloading files. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the structure and embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

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://jumiwimov.ru/strik?utm_term=algorithms+illuminated+part+1+pdf+download PDF link annotation
    • http://vvinorama.website/481614969453hzw0.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/84938756969.pdfIn PDF document text
    • http://55571.ru/fudarolakugomiabbv4.pdfIn PDF document text
    • http://lordtrans.ru/barcarolle_sheet_music_voicequp62.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/how_to_determine_age_of_rinnai_water_heater.pdfIn PDF document text
    • http://bestita.space/3516610362179sjn.pdfIn PDF document text
    • http://tapavinologo.mygamesonline.org/bedujikerex.pdfIn PDF document text
    • https://cdn.sqhk.co/waderapal/jfeshjd/tetajivisozokuzawasizan.pdfIn PDF document text
    • http://pojebanidik.mywebcommunity.org/57232441277.pdfIn PDF document text
    • https://cdn.sqhk.co/votiwixuduzo/0ugjjgc/mathematical_symbols_and_their_names.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473384/normal_5fccd7837ef54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458852/normal_6014449a29a14.pdfIn PDF document text
    • http://begemotiks.fun/824732650252dc6g.pdfIn PDF document text
    • https://cdn.sqhk.co/rirexiwudag/jfjjgdm/piano_tiles_2_song_8.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/FHgefpm/los_picapiedras_en_espanol_latino.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/wafuwaroja.pdfIn PDF document text
    • http://nedizilunok.myartsonline.com/medidas_de_llaves_en_mm_y_pulgadas.pdfIn PDF document text
    • http://mabesuj.rf.gd/glencoe_introduction_to_business_answer_key.pdfIn PDF document text
    • http://wetoxikilosawa.epizy.com/ignou_solved_assignment_2016_17_free.pdfIn PDF document text
    • http://nerezusilanake.atwebpages.com/mibozixipixikesokebaw.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_off0001087a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 5588 bytes
SHA-256: 5571a39176397a98e2773fe78cd37f9271b379e9b32b66d7cd396c4d9b000964
font_01_sfnt_off00011b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6A 11160 bytes
SHA-256: 53f849b729793ef8b5466b72382f18fd12afdca0453f676270a5662e6767f95e

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