Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb86bf26bee460c2…

MALICIOUS

PDF

84.8 KB Created: 2021-04-18 03:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1fafeef8641ab22bd29634c0d0d6be80 SHA-1: 8ebab466dfef6c993447551ad2dd4aea5f7a806e SHA-256: cb86bf26bee460c27d0e3a887f06c677e6c1b2e6a15bfa653dc94a5d2582a4ba
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious phishing content. It contains an embedded URI and a high-risk heuristic indicating an SEO redirector for a free-download phishing lure. The primary malicious URL identified is vilenefex.ru, which is likely used to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://vilenefex.ru/strik?utm_term=quran+translation+by+yusuf+ali PDF link annotation
    • http://constructionhouse.info/sijerakujabafalukimujudi4q5ll.pdfIn PDF document text
    • http://euroshopmn.space/craftsman_lt1500_mulch_kitybpkx.pdfIn PDF document text
    • http://zanartcc.net/how_much_do_army_reserves_get_paid_per_month3ypb0.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/bollywood_songs_naa_songsczmlq.pdfIn PDF document text
    • http://goromeo.club/blue_background_for_baby_boy_freef6227.pdfIn PDF document text
    • http://kudorifet.22web.org/tutorial_excel_2007_free.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://s3.amazonaws.com/lososimap/nice_hypertension_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/15809101805.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/77118094294.pdfIn PDF document text
    • http://paruwegugu.rf.gd/pototaxomumakubag.pdfIn PDF document text
    • http://jenotuxeje.onlinewebshop.net/the_abolition_of_man_full_text.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/aprender_a_leer_partituras_de_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/template_children_s_party_invitations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa5ede3b-3e0c-4819-8d46-ce5a97edf1d3/poxogos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc3f3bff-da77-45cf-96ec-69f8721347d2/getugapunam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89dd2909-3f20-447d-98f2-bd7cf38f5737/allegiant_air_military_book_flight.pdfIn PDF document text
    • http://watenuzigoxabi.rf.gd/veratamezijilonag.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/27263911912.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/luwukutus.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/princeton_sat_prep_course_reviews.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_off000101cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 4828 bytes
SHA-256: 606c00059b8ce2d1fd2bbe841d7143da259537b1df60adad3f7edc9c0757d115
font_01_sfnt_off0001123a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 11212 bytes
SHA-256: 21b6564f30172f40fb50282f806973d57498fe36e9ae22f4a5f3d792d6cf9fa1
font_02_sfnt_off00013805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13805 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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