Malicious PDF — malware analysis report

Static analysis result for SHA-256 1544f7fee9562f5a…

MALICIOUS

PDF

80.1 KB Created: 2021-04-02 20:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ee41729fac79d8f3196880efd4ae9dd0 SHA-1: 1f7d575125b481f19366706d12a6dea7fd16719e SHA-256: 1544f7fee9562f5a7f754b00eb083c02da353e7ada133809fa7685a13ad324f2
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the URLs. While no scripts were extracted, the primary attack pattern appears to be the distribution of malicious links disguised within a document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=how+many+pages+does+the+average+book+have PDF link annotation
    • https://cdn.sqhk.co/lirotigi/hbOghib/telugu_love_bgm_ringtones_2020_download.pdfIn PDF document text
    • http://cadenalia.com/safety_dance_song_downloady9fu9.pdfIn PDF document text
    • http://imkl-checker.com/feluporaboobx5n.pdfIn PDF document text
    • https://cdn.sqhk.co/kegetaxob/jjjergd/woxitozoma.pdfIn PDF document text
    • https://cdn.sqhk.co/burekugovon/kvDD8Iw/rational_algebraic_expressions_worksheet_with_answers.pdfIn PDF document text
    • http://teplotronic.ru/hand_lettering_worksheets8elqw.pdfIn PDF document text
    • http://specialsale.info/fobedafinukurcp4j.pdfIn PDF document text
    • https://cdn.sqhk.co/wovedajuraki/fjgYZje/first_aid_for_electrical_burns_ppt.pdfIn PDF document text
    • http://chambre.xyz/34230413865l7g1s.pdfIn PDF document text
    • https://cdn.sqhk.co/lewenowaxer/MSkgdCr/monster_roblox_royale_high_outfits.pdfIn PDF document text
    • http://biweekamnf.com/66881220812otwi7.pdfIn PDF document text
    • http://azakalaza3.xyz/griffiths_quantum_mechanics_3rd_edition_solutionsnnota.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/geXjdgh/playit_direct_jett_challenge_foosball_table.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/hfibiar/56215090499.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427085/normal_5fe06b01beeaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412387/normal_5fe2abf60e9ae.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/55689718423zthck.pdfIn PDF document text
    • https://cdn.sqhk.co/wisewuguv/njfXihf/kiss_fm_online_radio_station_romania.pdfIn PDF document text
    • https://cdn.sqhk.co/gesaxamadew/idBic4M/88240714839.pdfIn PDF document text
    • https://cdn.sqhk.co/jipogidara/jgogjji/32917959687.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/ghPpIjS/64021924317.pdfIn PDF document text
    • http://microdigitalmeter.xyz/que_tipos_de_comunicacion_oral_existensj98v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 5760 bytes
SHA-256: 8f2964fcb8c7308040176f1e969266b9674caaebe0e0f4847299e1d4ff60e78e
font_01_sfnt_off00010d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 10976 bytes
SHA-256: 0f084ffea8a67463bdb6ad745388afa3f31c331a2dbf968dd2f64adda33e3479

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