Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89b00ad7edf67d1…

MALICIOUS

PDF

77.5 KB Created: 2021-04-29 20:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6ffb4e0d8f9ba1a51858ea3e6f85cbc1 SHA-1: b3f2ca8cf8f6b9989b1d97e6a90139b7f758f8cf SHA-256: e89b00ad7edf67d1076a02f26e51a5d0a79b58143f84ba452e893fc96591c60c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'druttle.ru'. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document functions as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of external URIs and the link farm nature strongly suggest a phishing or redirection attack.

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://druttle.ru/strik?utm_term=what+are+the+top+5+coldest+places+on+earth PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377931/normal_606d6c4b47605.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/eichiji/strikers_1945_classic_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417220/normal_6026333094ec8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_601bbc6624998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410730/normal_6021bf2fb7384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387703/normal_600b57dec1c46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496571/normal_5ffe7ae62e348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_60176aa1e3677.pdfIn PDF document text
    • http://wevesapawuzu.22web.org/indonesia_business_visa_application_form.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/CM6jdab/10718020328.pdfIn PDF document text
    • http://suwidixofev.iblogger.org/21410708879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448719/normal_6036d2732932c.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/hdhjwif/weekend_getaways_from_chicago_in_october.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/381b1979-c148-4231-8104-5baf9b247b61/sulakufojudatuzagajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c57770-3b7d-41f9-bb3d-c6486e9cc21b/schwinn_570r_recumbent_bike_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d13524fa-3657-469e-a1dd-8f7fb4fb486b/44524535126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ec3377-872c-4527-a7d7-a217006ac202/what_genre_is_captain_underpants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e65c50c9-c665-4c44-ab21-7c4dc4931584/power_of_mind_swami_vivekananda.pdfIn PDF document text
    • http://tifoxirekurox.epizy.com/civil_air_patrol_blues_uniform_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/404ff21c-d9c1-452e-860d-73a1aa58ee6c/69065564514.pdfIn PDF document text
    • http://borebigedon.rf.gd/how_to_sync_afterglow_controller_to_ps3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4c28164-cf86-40ab-9686-408f94626cd6/36578496020.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_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 5296 bytes
SHA-256: 953442b002a62f168e4c87e889fa6e06d55f682034ba0b446ded82a3e88070a7
font_01_sfnt_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 10732 bytes
SHA-256: 2c730857a52b6deb7b7fcb44719e5cd2dcebe4b8a114526d9eee2d3cf262eec0

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