Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8277e9bc9fc79f6…

MALICIOUS

PDF

77.5 KB Created: 2021-04-30 03:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c2117258d900d972088917479a503770 SHA-1: 270f73aa312891c53f719ca9238d7fa5bb85de51 SHA-256: e8277e9bc9fc79f619734d0d825ba538cdce30f26c21b41013c970ab799b4708
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external URIs pointing to disposable hosting. The PDF structure and embedded links suggest a phishing or link-farming attempt, likely to distribute further malware or harvest credentials. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=what+is+the+translation+of+the+shema PDF link annotation
    • https://cdn.sqhk.co/vilomikov/t3lt6gg/pink_and_orange_ombre_glitter_nails.pdfIn PDF document text
    • http://vogudikomi.getenjoyment.net/atividades_educao_infantil_5_anos_para_imprimir_em.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/3c351c.pdfIn PDF document text
    • http://wigosixozem.mywebcommunity.org/79638063956.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/blumeria_graminis.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/berabotajim.pdfIn PDF document text
    • http://duxinivodozular.mywebcommunity.org/barron_s_gre_word_list_with_bangla_meaning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449406/normal_5fc72db73875e.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/ijmxKCe/lopusapepojenuwakerulul.pdfIn PDF document text
    • https://zazobowelukoki.weebly.com/uploads/1/3/0/9/130969428/3807ffb2bc4.pdfIn PDF document text
    • https://cdn.sqhk.co/subesanodag/fY4F9Ss/linear_pair_postulate_formula.pdfIn PDF document text
    • https://cdn.sqhk.co/bojowagawire/eUhjR1n/biwelud.pdfIn PDF document text
    • https://gasagadivegolix.weebly.com/uploads/1/3/4/4/134488570/cfafc22c08c0cfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476566/normal_6069602f814c8.pdfIn PDF document text
    • http://kedepoba.sportsontheweb.net/steps_to_personal_revival_sda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_5fdc6b16ccde0.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/as_time_goes_by_sheet_music_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480736/normal_60026564db2b4.pdfIn PDF document text
    • https://kapelasijad.weebly.com/uploads/1/3/4/3/134312752/dowotogufojap_rinusunobap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c525017-d59f-4ba9-be63-0f2ffd493067/how_to_find_trig_values_of_special_angles.pdfIn PDF document text
    • http://farovosodiwes.atwebpages.com/measure_what_matters_cliff_notes.pdfIn PDF document text
    • http://kopurelotalad.onlinewebshop.net/facial_nerve_disorders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47432d9f-1cb2-437a-ae84-6d740e26e80c/zusirozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b049d134-6914-4a78-8763-c3573bf2949e/96951159729.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_off0000f39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 5020 bytes
SHA-256: 20cacc00bae86328f1d555c3c3becf9de71e49d841a404b37e923b255030b2bd
font_01_sfnt_off0001048f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 10732 bytes
SHA-256: c6d0330ab001fc49e1d3128bd8d23e7a23c44492e90d9b8bece9928ccf761e07

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