Malicious PDF — malware analysis report

Static analysis result for SHA-256 8950ee244479a685…

MALICIOUS

PDF

80.1 KB Created: 2021-03-29 09:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b88dde8c1b12c7710f87662349955b6a SHA-1: 34806b9673f59a5591a797d3237998af17453d9e SHA-256: 8950ee244479a68556026bdb4aa7e62eafef4de8fb778cd9348a5db2c2c16acb
184 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 flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded links, such as 'https://dafemum.ru/strik?utm_term=2005+nissan+pathfinder+shift+problems', are designed to redirect users to potentially harmful sites. The ML classifier also strongly indicated maliciousness, supporting the phishing and redirection attack pattern.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=2005+nissan+pathfinder+shift+problems In PDF document text
    • http://pejelurim.getenjoyment.net/50585809713.pdfIn PDF document text
    • http://socialwave.me/what_size_tires_does_a_2017_subaru_outback_useobuv7.pdfIn PDF document text
    • http://biweekamnf.com/pazijikozivifux6epi1.pdfIn PDF document text
    • http://swiss-gear-top.xyz/bapegi4dmcw.pdfIn PDF document text
    • http://idealica-italy.site/873019838901qjwo.pdfIn PDF document text
    • http://beamorem.com/sugotisajewujd7k5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_60566c52ec555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_5fd17ca23666a.pdfIn PDF document text
    • http://hargotel.xyz/diferencias_entre_quimica_organica_e_inorganicac5nuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475203/normal_5febebad17b81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420222/normal_5fd9239e84e3d.pdfIn PDF document text
    • http://jirafka.space/budget_estimate_formatqgmc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498702/normal_6013485174751.pdfIn PDF document text
    • http://linza.media/66337531243fvkhs.pdfIn PDF document text
    • http://legendarycraft.ru/vibuzufhywzu.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/fosalizuzu/how_to_test_craftsman_19.2_volt_battery_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/vudumakitaresaxoriged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb911f5d-0148-4678-96a9-441e6772bac2/power_yoga_benefits_for_weight_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/what_was_letter_from_birmingham_jail_in_response_to.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/guidestar_india_registration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaa78993-6201-495f-8fd8-c845c1cefd32/aircare_humidifier_filter_reset.pdfIn PDF document text
    • http://kagijido.myartsonline.com/american_english_file_second_edition_vk.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_off0000fa74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 5724 bytes
SHA-256: 71dc388a4d43e3581f65b74e27b507764cdd7fe2c1a095917dbfdd628125702b
font_01_sfnt_off00010dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 10900 bytes
SHA-256: e99746588477cbccae2cac258535f2013e500a1de4171d1f6151b8aa5303544a

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