Malicious PDF — malware analysis report

Static analysis result for SHA-256 487834170f191ba8…

MALICIOUS

PDF

76.8 KB Created: 2021-02-05 07:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e5c2aaff44c31015656fab0aad2cf5c6 SHA-1: 77c1d263deb2d96fce04e7c50deab1545f587ea9 SHA-256: 487834170f191ba86968d1ccd349d74be2b943e32b9b4a1299e58bf83a475c5d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, suggests a lure related to an 'agreement of sale template for a vehicle'. The presence of numerous external URIs, many hosted on disposable domains or link farms, strongly suggests the document is designed to redirect users to malicious websites. No scripts were extracted, but the PDF structure and URI findings point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=agreement+of+sale+template+for+a+vehicle PDF link annotation
    • https://dakilemuvepin.weebly.com/uploads/1/3/5/9/135963620/pobesivunuw-zutanegomoxibig-jomuwev.pdfIn PDF document text
    • https://vurabagugodemox.weebly.com/uploads/1/3/1/1/131164039/kipetuluva.pdfIn PDF document text
    • http://armada.technology/conversaciones_con_dios_libro_4_gratis9e5h3.pdfIn PDF document text
    • https://jefabogab.weebly.com/uploads/1/3/1/6/131636769/borefuk_gifevimokegivo.pdfIn PDF document text
    • https://cdn.sqhk.co/lijuwezasip/mieifib/35607318155.pdfIn PDF document text
    • https://jusodizepo.weebly.com/uploads/1/3/1/0/131070216/xejuxexukimir.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/hjijcjc/politics_and_the_english_language_questions.pdfIn PDF document text
    • http://natorg.fun/fiasco_rpgvpyqu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464315/normal_5ff9bd85efb37.pdfIn PDF document text
    • http://drive4mclaneaustell.com/civil_war_cbr_mega1vsog.pdfIn PDF document text
    • http://remontnatali.ru/trade_license_form_chittagong_city_corporationtae6k.pdfIn PDF document text
    • http://mgacessoria.online/semuziselajedikarefkeyjy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384150/normal_5ff8398f60a19.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/wbC5ghG/45735013311.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/fatisake/vesup.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/conditional_formatting_duplicates_across_multiple_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/bexar_county_arrest_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/additive_combinatorics_terence_tao.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_off0000f042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 5476 bytes
SHA-256: a9d6ccdd5898391888cfdbe9e6ad6e9f67b6b693181a362a29e7a2deb24da89e
font_01_sfnt_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 10264 bytes
SHA-256: ff98f5e7be39e6a84978d6f16044c281d07d11c94d5455f58f8a6bd98ad4ef67

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