Malicious PDF — malware analysis report

Static analysis result for SHA-256 a086f3a572ee0895…

MALICIOUS

PDF

63.8 KB Created: 2021-01-11 00:10:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7dd9bab5fd7adfa9bc054dd081739204 SHA-1: c8b55cfb039acbd40303cd8320492d54b27c105d SHA-256: a086f3a572ee089534d5216498ce7373f3440842270392103e40f1a01815ee77
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically a phishing or trojan threat. The embedded URLs, such as 'https://trafficel.ru/wb?keyword=history%20vault%20app', suggest the document is designed to redirect users to potentially harmful sites.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafficel.ru/wb?keyword=history%20vault%20app PDF link annotation
    • https://bipovubukixepev.weebly.com/uploads/1/3/2/7/132740720/luwunovukiwetib.pdfIn PDF document text
    • https://site-1191950.mozfiles.com/files/1191950/nick_mullens_49ers.pdfIn PDF document text
    • https://site-1175422.mozfiles.com/files/1175422/quran_arabic_to_bangla_translation.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/xijalovelokolep/83961030405.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/dilowagekijonopow.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/ro_mineral_water_plant_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/ashes_cricket_2019_game_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/daffynition_decoder_answer_key_page_79.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/salopezewewuzavoxejazarud.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/74482194195.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/cisco_packet_tracer_free_5._3.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/77756527269.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/angioedema_treatment_guidelines_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/vabimisexudatid.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/word_crossy_level_1433_answers.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_off0000bcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC8 4936 bytes
SHA-256: 5d887d22af294643486036244fa999ce43305dd76153efad43f4b4d7c1fcce2f
font_01_sfnt_off0000cdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAA 10840 bytes
SHA-256: 7985912b668bab9a8efa8eedd31d380c41f74627b53ed67863e180bf8af71e56

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