Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fd66113b9d2277…

MALICIOUS

PDF

79.8 KB Created: 2021-03-25 09:31:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 35e353f35c3ceed97e7a19a6036bff6d SHA-1: 5802917ebe4ba3b124030b831ffd8b552242a6d3 SHA-256: b4fd66113b9d227729f9e9b54dcc2bad30019c0f76451f1618445b24af94b358
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous disposable domains, with one URL specifically mentioning 'award' and 'antimycotic drugs pdf', suggesting a potential phishing or scam lure. The presence of embedded URLs and the PDF structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=antimycotic+drugs+pdf PDF link annotation
    • http://wawesoja.sportsontheweb.net/95611100336.pdfIn PDF document text
    • http://tizezs.xyz/unfair_advantage_lean_canvas_definitioni3jnw.pdfIn PDF document text
    • http://kefijor.mygamesonline.org/jevosevigotiwuzemar.pdfIn PDF document text
    • https://nabozuritofawun.weebly.com/uploads/1/3/1/8/131857241/8228792.pdfIn PDF document text
    • http://lejunuzegakikuv.mypressonline.com/prayer_for_all_souls_day_2017.pdfIn PDF document text
    • http://fruct.space/42823234773tj6vl.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/iigghgc/35932027686.pdfIn PDF document text
    • https://buzotenugi.weebly.com/uploads/1/3/1/4/131408099/pekewariw.pdfIn PDF document text
    • http://topcabinets.xyz/what_is_the_best_travel_water_flosserbonwy.pdfIn PDF document text
    • https://cdn.sqhk.co/sesizame/gZOjdVp/delicious_egg_recipes_for_lunch.pdfIn PDF document text
    • https://cdn.sqhk.co/fexiseme/hczihbQ/tidiwuj.pdfIn PDF document text
    • https://lilikegemuvil.weebly.com/uploads/1/3/1/3/131398424/1248259.pdfIn PDF document text
    • http://venira.su/henry_kissinger_diplomacy_quotesy75st.pdfIn PDF document text
    • http://erogan-columbia.site/fufemu4us2h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://positajugopisu.myartsonline.com/arab_league_history.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/72733610622.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/blackboard_mobile_learn_app.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/23162783044.pdfIn PDF document text
    • http://penanaras.myartsonline.com/87677722296.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/rewiniximekover.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_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 5324 bytes
SHA-256: 582d695b19e1b7ebba0c95a0ce6bc42d20f183ca69e71f157aa1067a960b1fdf
font_01_sfnt_off00010cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAB 11108 bytes
SHA-256: b6a7cde827da7ddc264c9d65ce6ee8e22ee9bb446a73b80c2cdb5b6258bbc9d6

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