Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc9f5f59b302113…

MALICIOUS

PDF

95.2 KB Created: 2021-03-08 11:55:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b839ea45045571c7d6c752586e7805b5 SHA-1: 8e663e295730ee9ee99ac4d0e73d6a44b681e371 SHA-256: 8cc9f5f59b3021132846b8d25a45a2723ecd9d2f5ea585efa31af385cf2c6a3e
126 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 likely part of a link farm designed to improve search engine ranking for specific keywords. The primary malicious URL identified is https://maypoin.ru/wix?keyword=the+undercover+economist+pdf+%25D9%2585%25D8%25AA%25D8%25B1%25D8%25AC%25D9%2585, which is likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://maypoin.ru/wix?keyword=the+undercover+economist+pdf+%25D9%2585%25D8%25AA%25D8%25B1%25D8%25AC%25D9%2585 PDF link annotation
    • https://wimupajano.weebly.com/uploads/1/3/4/6/134682998/sibakabulu.pdfIn PDF document text
    • https://jobadenel.weebly.com/uploads/1/3/1/1/131164033/4923252179a.pdfIn PDF document text
    • http://wide-do.top/29163474561475u6.pdfIn PDF document text
    • http://myfavoritesun.xyz/magic_bullet_parts_mb1001bsno3e.pdfIn PDF document text
    • http://vovality.club/homeless_survival_guidecgjon.pdfIn PDF document text
    • https://pasorizafam.weebly.com/uploads/1/3/4/0/134096756/pazakexudaneg.pdfIn PDF document text
    • http://profer-opt.ru/xemaxubifexebagafawutuvidn5g4t.pdfIn PDF document text
    • https://teribupugabi.weebly.com/uploads/1/3/4/8/134852699/datel-gamozetew-jojigidef-ligogo.pdfIn PDF document text
    • http://milanomoda.site/will_mcbride_show_me_downloadn83v6.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/fd9591a.pdfIn PDF document text
    • http://teachost.com/used_life_fitness_cross_trainer_for_sale_uksfux5.pdfIn PDF document text
    • http://uptodate.site/rizonox9hbdf.pdfIn PDF document text
    • http://getsalle.xyz/26535205438yt3g8.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/pokorevalaxex/mikojepofepopedopo.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/79888921574.pdfIn PDF document text
    • http://gototura.myartsonline.com/electrolux_refrigerator_repair_service_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d259ba2-120e-46f9-b31d-b116eb2f6da8/metro_2035_audiobook_pl_cao.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b22986-013b-4608-b293-3f0ce171ed81/1548034533.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/18017441573.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/analyzing_political_cartoons_chapter_7_answers.pdfIn PDF document text
    • http://zuputes.atwebpages.com/brother_pt-d200_power_adapter.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/spotify_premium_apk_offline_2019_iphone.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/xigediwaviwekewalez.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/android_headphone_amplifier_app.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 5160 bytes
SHA-256: 0917895ad554ecabd6b55dcbdf538a701d6be4d04c071ffb16bfeff8a043f3e0
font_01_sfnt_off00011878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11878 11032 bytes
SHA-256: 981c4b7372d4b2fb9b5a9969e3abefb97185ecea9054808b88c9167c648dff7c
font_02_sfnt_off00013daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAF 16728 bytes
SHA-256: c66271cf26487cee469d325c9e7248c06d85ef86c7677d5c8f5ee5df896497f6
font_03_sfnt_off0001551e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1551E 16632 bytes
SHA-256: c50702d4acfbab276db04c5221898060464ebd298806f96ba401251afed68d5e