Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec718a20786908da…

MALICIOUS

PDF

81.4 KB Created: 2021-03-16 17:15:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: df8541a6df548fd657e9ce5def29e37c SHA-1: e9498a3be207ca3354f6f5908f398cfb93b8bdbf SHA-256: ec718a20786908dafe4f723cd64edff0bfcebbc678e722ff2a280a3b36130eb8
186 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, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lead users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://xajibur.ru/award?keyword=data+analysis+using+excel+2020+pdf PDF link annotation
    • http://fotonagosuslugi-01.space/eat_it_all_lemmyqav7w.pdfIn PDF document text
    • http://datab.vip/diy_halloween_paper_crafts_easyme41e.pdfIn PDF document text
    • http://copytoshka.ru/17406851104rreu5.pdfIn PDF document text
    • http://ig-support-service.com/fusukisedibozvuo9y.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/ZFiaigD/special_warfare_recruiter.pdfIn PDF document text
    • https://cdn.sqhk.co/wumigapinido/hiihMJx/diablo_3_necromancer_inarius_speed_build.pdfIn PDF document text
    • http://numberoone.xyz/69420362508se1dn.pdfIn PDF document text
    • http://podarokinsta365.site/sotolulozisafunopukokewak505g1.pdfIn PDF document text
    • http://forsage.pw/4322088148782rve.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
    • https://uploads.strikinglycdn.com/files/6d99c5b6-20fa-4646-8c9e-d69367ba1249/brinks_home_security_system_monthly_cost.pdfIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_f983251b977643c8bb0185fc5978ff86.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda501b7-0d5e-4f11-a1c1-1777270b8224/94516738000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f64807bc-b4af-4f20-88b7-e526295b28b5/88269529286.pdfIn PDF document text
    • http://vumamuv.myartsonline.com/zunubipu.pdfIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_49889638ec0f4332b2f98d0247907bf3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3400737d-b7e2-401e-8c4b-40203025b3c5/12_week_crossfit_program_for_beginners.pdfIn PDF document text
    • http://defakulid.atwebpages.com/java_programming_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dfc4d24-5d5c-4513-9ee5-ebb4b7f8ac63/navy_officer_fitrep_closing_bullets.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_7690f072634e4a948f43c3e6fd76f6c8.pdf?index=trueIn 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_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 5444 bytes
SHA-256: e980292290e2f3c2ff03098ba72aa00c672ab0cb8e57b20157e182b641ddc232
font_01_sfnt_off00010541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 10932 bytes
SHA-256: 416e76073c5c27ebbedbadabddc6949b80dae8396db121a87178f570c82d3962
font_02_sfnt_off00012a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3