Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9349af02d07b67…

MALICIOUS

PDF

78.5 KB Created: 2021-03-10 02:50:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 685294ef9aeef0ef08fadaacd7255af9 SHA-1: 75e6a561967bd6f031db205c45c085c2985acda5 SHA-256: 5d9349af02d07b679cf2b0d8c4002937e5b783c1df82995567c1577f4931e409
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to financial markets, likely intended to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/award?keyword=asymmetric+information+in+financial+markets+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416810/normal_6039b69aa1549.pdfIn PDF document text
    • http://begetus11ppz.xyz/217613270628md3f.pdfIn PDF document text
    • http://avit0.cc/milftoon_site_ripo0tcz.pdfIn PDF document text
    • http://profyhouse.ru/pufupupuwojuvumolinirifhhz3l.pdfIn PDF document text
    • http://supermagazforsale1.xyz/papanasivotakopazawumipagpeqzx.pdfIn PDF document text
    • http://mosaniz.22web.org/table_calendar_2019_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393638/normal_5fec51f54bd5a.pdfIn PDF document text
    • http://petrol-v-pol-price.site/hollow_knight_mushroom_ending_guidexpmdc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425511/normal_5ffa3efd5e74d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388157/normal_600bd50829689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_6009bbb80ee07.pdfIn PDF document text
    • http://jigatinapa.22web.org/xinunuvipifip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_4b97063e6b114ada97484e7213af3168.pdf?index=trueIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_d883a586622c4a5990f0fd872960b137.pdf?index=trueIn PDF document text
    • http://xemaneruweveji.epizy.com/56613168570.pdfIn PDF document text
    • http://bavidoripo.epizy.com/how_do_i_live_a_peaceful_life.pdfIn PDF document text
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_15d02f1e09844b5ea4137934b128eafc.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_970f00b9178a4774aab8fce6d19e26c0.pdf?index=trueIn PDF document text
    • http://zaravugudag.rf.gd/80245098057.pdfIn PDF document text
    • http://seladetitogar.epizy.com/koko_the_gorilla_who_talks_worksheet.pdfIn PDF document text
    • http://miviguwi.epizy.com/31734872843.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_5065e5f5d7da49088d6b347817aae477.pdf?index=trueIn 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_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 5456 bytes
SHA-256: 73b0a926ab757cb579775849ffbad8f444bacdbc1f22c7c83db51e11c5b71da7
font_01_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 10660 bytes
SHA-256: 94ad91ae79fa5e10eb1c6014e81237afad727bdbcebefd499d2935fe164b49f4

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