Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ad4f1b8b1d6fa0…

MALICIOUS

PDF

78.0 KB Created: 2021-03-22 02:31:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2bc7fda0a42f08a2b19d442f7c034106 SHA-1: da7ab2976490800f38b12f7dc26958458355ecf4 SHA-256: 22ad4f1b8b1d6fa0c4887eaccbaab93726c61d1c1755374c9150492fe5fd0a56
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, pointing towards a phishing or malware distribution scheme. The embedded URLs, such as 'https://zajinet.ru/award?keyword=abandoned+farmhouse+pdf', are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/award?keyword=abandoned+farmhouse+pdf PDF link annotation
    • http://mon-fortuneo.best/beer_pong_tournament_auckland_20205kr9v.pdfIn PDF document text
    • http://vipmanmarket.space/53253917306bnstm.pdfIn PDF document text
    • http://trickyturkey.com/conversor_pulgadas_a_mm_tablap8n7u.pdfIn PDF document text
    • http://leafester.online/advanced_excel_formulas_with_examples_in_excel_sheet_free_download0ykgw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384835/normal_5fef171cf27b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456389/normal_5ff8f272f1442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489058/normal_604cb5b2ce056.pdfIn PDF document text
    • http://bulubuzigajuzar.getenjoyment.net/anatomy_of_heart_valves.pdfIn PDF document text
    • http://helplnstagramoffice.com/modern_abc_of_biology_class_11_bookjpybl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458394/normal_6036ae47c5477.pdfIn PDF document text
    • http://forpost-electrica.ru/balance_general_comparativo_en_forma_de_reportelqhrx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490266/normal_5fdc07510d10f.pdfIn PDF document text
    • http://sweetygirl.club/jijuvivujife7ie5r.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/favigukoxoropeg.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/types_of_storm_fronts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lofekelatek.epizy.com/2123473144.pdfIn PDF document text
    • http://vedujekobizu.rf.gd/anamika_academy_english_grammar.pdfIn PDF document text
    • http://zegudonokor.epizy.com/gikuvofo.pdfIn PDF document text
    • http://neketepa.myartsonline.com/merge_pdfs_function_in_r.pdfIn PDF document text
    • http://mimodiko.epizy.com/antropologia_medica_pizza.pdfIn PDF document text
    • http://porugunime.epizy.com/leduv.pdfIn PDF document text
    • http://pisibagavorinow.epizy.com/pexakisurogojiji.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_off0000f4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A9 5376 bytes
SHA-256: 6ea07d6e842a7ded9c16ecb3417550f289531760d02270ac1e0a58576bd46034
font_01_sfnt_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 10960 bytes
SHA-256: 6f82cf9c83da61b95606376d19f7dff4a7f43f998a04fb292e9b66737f4a0033

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