Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e801b161ae06cde…

MALICIOUS

PDF

101.9 KB Created: 2021-04-15 23:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ef48fb1f6de364807ea9e221bcd12b87 SHA-1: 597b0b2a2a7ba1b8477dda50e43b607032f6646f SHA-256: 8e801b161ae06cdebf593e82a58001a95101c34adba96a40d186f7a655392e35
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on directing the user to `https://mezovuduw.ru/strik`. This URL is part of a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/strik?utm_term=computer+hardware+pdf+in+hindi+download PDF link annotation
    • http://se-mrush.com/wurokuduvuwobizijstcf.pdfIn PDF document text
    • http://stav-games.ru/nasogefibavuganomumojojjfng.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457876/normal_6008289969435.pdfIn PDF document text
    • http://nekimul.22web.org/obc_caste_certificate_format_for_central_govt.pdfIn PDF document text
    • http://sarhello.online/485948463599ss2q.pdfIn PDF document text
    • http://gezudozu.iblogger.org/cache_memory_in_computer_organization.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368788/normal_602ee0650a841.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://karifopiti.epizy.com/xepifitomivud.pdfIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_3137bb11ecd144999689f20462f8cef2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ffa8ba-9846-43b0-a25b-cb76482076cd/video_conferencing_protocol_h.323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fdccc5d-bd26-4acd-9e50-f61a972c80e2/hp_photosmart_7525_ink_refill.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/bollywood_songs_site_list.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/29400682690.pdfIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_170c616a854f48c3845dc5bbf6d08ddc.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE8 5100 bytes
SHA-256: be823cea0c5dd814fbbc52308d59da7eb57912e4ec7196a96b9a04b9b7e72279
font_01_sfnt_off00012d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D21 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off00013883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13883 9916 bytes
SHA-256: a3006ce966641bf23e14f995482b32f4c48a8e393fef7e8cfcce480c135d8d3b
font_03_sfnt_off00015ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC1 16268 bytes
SHA-256: 039b4c1e58cf451abf58d63b34da0707ecd9b7fc4f1a3162dd8c817be0edd8c4

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