Malicious PDF — malware analysis report

Static analysis result for SHA-256 7730ee0167558f1d…

MALICIOUS

PDF

76.9 KB Created: 2021-03-16 19:45:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 865efcfc0db0c18ded75939fc5567fa4 SHA-1: 728f65b89a1372b2cd47ec7f723e9458fba084dd SHA-256: 7730ee0167558f1d745bdc6271f501116d797e39c2cd416586ac5a68ed8b854a
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of many suspicious URLs suggests the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://kuzutuzo.ru/strik?utm_term=the+dragonbone+chair+movie
    • http://revujutipisan.22web.org/assassin_s_creed_odyssey_ps4_code.pdf
    • http://net-klientov.ru/laxenubci9u.pdf
    • http://santand-es.com/civil_engineering_words_dictionary5uxa2.pdf
    • http://armlur.space/chickamauga_dam_fishing_reportjhgj8.pdf
    • https://cdn.sqhk.co/lajoroteb/jaiehbt/2076418375.pdf
    • http://winoorama.fun/94022934301oj307.pdf
    • http://zixaxagewan.mypressonline.com/is_there_a_wings_of_fire_graphic_novel_4.pdf
    • http://wssummer.space/path_of_exile_the_baron6i8fa.pdf
    • https://cdn.sqhk.co/xekejegixawo/Q9RhaOI/40944764751.pdf
    • http://shopsmmv.site/baby_trend_ez_flex_loc_infant_car_seat_manual7lfzs.pdf
    • http://paruxezogu.mygamesonline.org/kitchenaid_professional_600_parts.pdf
    • https://cdn.sqhk.co/tiwefuxab/dijym92/infectious_disease_specialists_colorado_springs.pdf
    • http://gloslides.com/prayer_for_godchildzl4kp.pdf
    • http://patajafurep.mywebcommunity.org/after_book_anna_todd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bufexa/risk_of_rain_2_characters_guide.pdf
    • http://domuromu.atwebpages.com/sabelevomupi.pdf
    • https://s3.amazonaws.com/perurulexi/nutigaketirexoxatupo.pdf
    • http://xetobagog.rf.gd/65846359664.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_off0000f0e3.bin
c0c846f46d3c6ffb8be623449a878fbd8120759f9bbdf7d0c6e9974be6e0beab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 5292 bytes
font_01_sfnt_off000102bd.bin
a88a5d003a013ce080946344c06c067fad463ecdcffa2d8dde58d6cc60e01baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102BD 10536 bytes

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