Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcbd18ad23a40d1…

MALICIOUS

PDF

72.9 KB Created: 2021-03-11 02:31:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 166bd2dcbcc386ca1cbdfc7f4edece0f SHA-1: 9fb452a7cc6b6ca8e8abcbd52a3c8c3289f10176 SHA-256: ddcbd18ad23a40d1a17a044216c906c9433c8e846ae4edb341f5392719304b73
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which point to seemingly unrelated PDF documents, suggesting a link farm or SEO poisoning tactic. One of the primary external links, 'https://vilenefex.ru/wix?keyword=decibeles+en+ingles', is likely used for phishing or to serve a secondary payload. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, suggesting it may have been generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=decibeles+en+ingles
    • https://cdn-cms.f-static.net/uploads/4369486/normal_60132a32b2046.pdf
    • https://static.s123-cdn-static.com/uploads/4416796/normal_5fef027412a9c.pdf
    • http://sunshop.pro/easy_rum_cake_recipe_with_yellow_cake_mixlx943.pdf
    • https://static.s123-cdn-static.com/uploads/4412382/normal_6007a96fa4974.pdf
    • http://lnstagramverifiedbadge-form.com/how_much_does_a_native_american_get_paidymn9y.pdf
    • http://cabinetsop.xyz/samkshepa_sundara_kandamhad8q.pdf
    • http://mp4.design/87842660064jhwej.pdf
    • https://fimegelepa.weebly.com/uploads/1/3/3/9/133999933/2636255.pdf
    • https://static.s123-cdn-static.com/uploads/4367296/normal_6003a7406d9ad.pdf
    • http://ukranews.icu/kadunuparenavifowe1a0nr.pdf
    • https://gowumobajakexe.weebly.com/uploads/1/3/4/5/134585768/sitoravo-sazewuwagabo-kixafofelujako.pdf
    • http://wegansit.space/823380249099pbjc.pdf
    • https://vamukeroke.weebly.com/uploads/1/3/4/3/134353023/8613275.pdf
    • http://dkmz2.club/is_fox_available_on_dish_networkignug.pdf
    • http://fullcreditreport.info/columbian_exchange_graphx6wpn.pdf
    • http://yourdesk.website/50464983267dadru.pdf
    • http://modernstyle.pro/363660580764b6i.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/titugome/data_science_interview_questions_amazon.pdf
    • https://s3.amazonaws.com/tasufagijaremo/focusrite_scarlett_2i2_drivers_free_download_windows_10.pdf
    • https://s3.amazonaws.com/fizup/philips_tv_supported_formats.pdf
    • https://s3.amazonaws.com/faduxodiwo/poval.pdf
    • https://s3.amazonaws.com/nitidadufetenu/appointment_letter_format_in_word_for_teacher.pdf
    • https://s3.amazonaws.com/xanunafojuloki/kuvemuvekogovu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd5c.bin
9172a6520dd268e38ad3beccc399f3f397ef2e0e604bc759683c82c387d6059e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 4800 bytes
font_01_sfnt_off0000edcd.bin
46dd55f97e91c069d7179ff3b3fd7f17b01993b302f7979d71a353c6724e9a9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 11824 bytes

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