Malicious PDF — malware analysis report

Static analysis result for SHA-256 57572ead3d1a4abe…

MALICIOUS

PDF

89.8 KB Created: 2021-05-04 03:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b10091d3a956f9df4e271c1fa60c2b3f SHA-1: b172b5016e827bd2a74a254c732b6d06802fa879 SHA-256: 57572ead3d1a4abe82abe261f5c6e1336e2545c6aa3fc445b3a1166233e24210
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to malicious sites, as evidenced by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_URI' firings. The embedded URL 'https://midufefew.ru/strik?utm_term=descargar+la+santa+biblia+en+audio+espa%25C3%25B1ol' suggests a lure related to downloading audio Bibles, likely a phishing pretext. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/strik?utm_term=descargar+la+santa+biblia+en+audio+espa%25C3%25B1ol PDF link annotation
    • http://revilokepudidu.mygamesonline.org/tunovozojobovukeb.pdfIn PDF document text
    • https://xixusumer.weebly.com/uploads/1/3/0/8/130814933/bexitofu.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuviju/njhiejd/buwimu.pdfIn PDF document text
    • http://danifewikusi.scienceontheweb.net/cultura_brasileira_alfredo_bosi.pdfIn PDF document text
    • http://nijepatexosanus.medianewsonline.com/34208705514.pdfIn PDF document text
    • http://vutunema.mypressonline.com/avatar_comics_imbalance_part_2_download.pdfIn PDF document text
    • https://mizabago.weebly.com/uploads/1/3/5/2/135299272/5042a3273c0f594.pdfIn PDF document text
    • https://resafuki.weebly.com/uploads/1/3/1/3/131398359/7963279.pdfIn PDF document text
    • http://kijekidajefi.getenjoyment.net/third_grade_math_word_problems_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/mamozinuba/oUajiia/26024145001.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/2818522626.pdfIn PDF document text
    • http://vawabipoxe.sportsontheweb.net/19841133375.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/barrons_gre_22nd_edition.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/nifewaxos.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/dudiwepu.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/1001_spells_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fokatekox/Rhbhccm/9781822551.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/KAjhhiP/hearts_of_iron_4_review_ign.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/ehf51ih/kumemamelopu.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/jofunozuzof/servicenow_email_client_template_script.pdfIn PDF document text
    • http://jabejanaboz.atwebpages.com/39701066192.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/door_cad_blocks.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/revakuzage.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/jevonuliwaxipanomoru.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/ear_canal_cholesteatoma_formation.pdfIn PDF document text
    • http://jaminuzifibe.onlinewebshop.net/convite_a_loucura_brennan_manning.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_off00011b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2D 5592 bytes
SHA-256: 51f4e6b80e0f34036069c099317bf6569ac560500078b5bb346460025ff43136
font_01_sfnt_off00012df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF9 12724 bytes
SHA-256: dee6d6ddd5bca6808ad1e68a7875239ff4b0671a5bfcb0b354e79e138d01c1df

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