Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cdf891b3cbf9a9…

MALICIOUS

PDF

75.1 KB Created: 2021-03-01 00:33:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 44c783f6d3c76843b9c0dc41114c4d4f SHA-1: 29411ed0837510995a32063238e7021ba43ebcd1 SHA-256: 92cdf891b3cbf9a9e0f1174ad70cc2c5a20a5744fa6e9995bae65cc17a799242
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, which is characteristic of a link farm used for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing payload or malware disguised as a study guide or game download. No scripts were extracted, but the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bologen.ru/strik?utm_term=17+indisputable+laws+of+teamwork+study+guide PDF link annotation
    • http://winoorama.space/j2me_loader_download_games9hjge.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/6592202.pdfIn PDF document text
    • http://mamajan.space/hack_someones_instagram_password_no_surveyegb3c.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/fjgIijB/tejegaxu.pdfIn PDF document text
    • https://cdn.sqhk.co/gabamulijawe/gijjFie/download_game_sniper_3d_gun_shooter_mod_apk.pdfIn PDF document text
    • http://technodom11.com/fodazumus3czp.pdfIn PDF document text
    • http://mybiol.site/derulopotogafimuvuvivo0nnrd.pdfIn PDF document text
    • http://eeuuurrrrr.space/78675932354rcln7.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/l3jfkij/mirugususufoxobixope.pdfIn PDF document text
    • http://dietnatur.fun/rick_and_morty_game_recipesqbv0b.pdfIn PDF document text
    • https://cdn.sqhk.co/dobulefipuji/qjap7GL/blockchain_wallet_scams.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/enHhjTo/barbie_dreamhouse_adventures_season_4_episode_2.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/yEkMvih/midarifoguxabuposiz.pdfIn PDF document text
    • http://mixed-rootwork.com/kugofijiwafajemond1wv1.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/69007784284.pdfIn PDF document text
    • https://salogisamokowo.weebly.com/uploads/1/3/4/6/134649366/5072904.pdfIn PDF document text
    • http://salearea.pro/toteruxef6bdd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/zexudezov.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_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 5796 bytes
SHA-256: 0769ec0c8ebae7fb50dd21f4aba115f40b9384afd5a687b9e81ead2b6e0c65f4
font_01_sfnt_off0000f90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 11280 bytes
SHA-256: c85d25fa891a077cc109fd0c4e85436654229261a8c3111c43c2b63d2a6a66ce

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