Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b6b18703cde072…

MALICIOUS

PDF

74.5 KB Created: 2021-06-01 08:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0129481cfeb6043ef477fc212ca60d4b SHA-1: c31f044b6c54e271076f973d30adcc962f798dfa SHA-256: e9b6b18703cde07205cf9f7fd56bf27abfee94ac534f942be5ed9dfccc7dec6e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a likely attempt to obscure malicious links or distribute content through a large number of domains. The primary malicious URL identified is https://drafthe.ru/pbw, which is likely used to host a phishing page or a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://drafthe.ru/pbw?utm_term=tendances+c1+c2+guide+pedagogique+pdf PDF link annotation
    • https://fobaripiso.weebly.com/uploads/1/3/4/4/134443650/nuzewe_viwudin_doreroridet_zamadisepajam.pdfIn PDF document text
    • https://xadiditenir.weebly.com/uploads/1/3/4/7/134763486/f73104a8.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/13784fe5b3d2903.pdfIn PDF document text
    • https://xeravatiwawu.weebly.com/uploads/1/3/4/6/134603636/fetepixesikopak-wemap-kojud-puxoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489730/normal_602df70c17f56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423188/normal_600a4c0d88c4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fadoposapat.pbworks.com/w/file/fetch/144448389/81225290691.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/pakewadesubiri.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/f/92814395720.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/f/40223575052.pdfIn PDF document text
    • http://fotikeralo.pbworks.com/w/file/fetch/144443814/pimizuref.pdfIn PDF document text
    • http://zikasamu.pbworks.com/w/file/fetch/144432135/25th_anniversary_quotes_for_parents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cd9e0d4-6c94-4517-9d63-31d4eca043ce/18579654906.pdfIn PDF document text
    • http://zeladejan.pbworks.com/f/25994161828.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144412797/logic_pro_x_trial_mac.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/w/file/fetch/144443568/analytical_solid_geometry_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/878b4b5e-77b7-48d0-9e84-08c4ea0e8d5d/carry_on_lyrics_kygo_traducida.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/zojopexalatexif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/239b388e-e39e-46ff-9743-0b839358b7c9/what_is_the_late_fee_for_uhaul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea3d0140-2617-488e-ad52-b104c15c7a70/bell_jar_book_cover.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/messenger_apk_iphone_6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 5256 bytes
SHA-256: ac76ec3ebb313c95b88f3e577789cd4d6ddce6656600961714fb800a986ed217
font_01_sfnt_off0000e464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE464 12700 bytes
SHA-256: 328184925b6737517e5dc76ade6a1e0ab28b2aafb4c3db87c97888a8f2c28522
font_02_sfnt_off00010cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD4 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333