Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c648663a61db97…

MALICIOUS

PDF

84.8 KB Created: 2021-04-09 11:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 4b4497d02f597194c03122c0752ddf61 SHA-1: 4b6a0fe95ac352ce170afbb65e864145f449cc07 SHA-256: f1c648663a61db9740829c470994dd79df2e56214989bb46918fdb05317850d0
74 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting, suggesting a link farm designed to redirect users. The presence of urgency language in the document body further supports a phishing or scam attempt. The ML classifier strongly indicated maliciousness, and the PDF structure with multiple external URIs points towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jottigo.ru/strik?utm_term=does+shade+die+in+red+queen PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478655/normal_600f13ce8202e.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/b145e00f.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/whf6hdm/21038406828.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/fegabamirikuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453721/normal_605add5a6821e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_600fe0540ada1.pdfIn PDF document text
    • https://cdn.sqhk.co/ritasuxa/Rieuxib/alphazero_vs_stockfish_1000_games_pgn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403422/normal_5fc8f92fbd545.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485296/normal_5fcef613c6ee8.pdfIn PDF document text
    • https://jobadenel.weebly.com/uploads/1/3/1/1/131164033/a7d19b6f.pdfIn PDF document text
    • https://juwibaviwexufeb.weebly.com/uploads/1/3/0/7/130739975/sewab.pdfIn PDF document text
    • https://zatiwakap.weebly.com/uploads/1/3/1/8/131871625/8444558.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/gf5YEjb/download_sparkle_photo_effect.pdfIn PDF document text
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/21a034035306.pdfIn PDF document text
    • https://cdn.sqhk.co/basinasedu/izgjfgc/97626921783.pdfIn PDF document text
    • https://cdn.sqhk.co/mevojazix/NgcifoF/hop_valley_alpha_centauri.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://uploads.strikinglycdn.com/files/b401d512-2307-4b3f-b7a4-f7812bcdbf75/bozetimijejizevaguxigi.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/43850472345.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/is_yahweh_the_personal_name_of_god.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/traductor_de_espaol_a_ingles_americano_con_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/647c0c89-e07b-4b90-8b63-d0c6954efeb1/36566724.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/how_to_use_prestige_pressure_cooker_manual_high_pressure.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/milupexib.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_off00010081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 4808 bytes
SHA-256: 5224a564e0ddfd29093c491e5ceb73ad4024f43ce5311319f09b6d4eb0f9bf20
font_01_sfnt_off000110ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 11076 bytes
SHA-256: bbeeac634acd66479fef59ee91f33b34a74e519fffb0d54569a796d074aa2136
font_02_sfnt_off0001363f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2