Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef28d0c69efa3f5b…

MALICIOUS

PDF

68.0 KB Created: 2021-03-30 17:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c165f65b3222875e545699a80702c985 SHA-1: 7f66b211b06ab1361230b44314845916e71a02d4 SHA-256: ef28d0c69efa3f5be59760419c9535711aaf007bcf7e89cdad56ec8d08a1291d
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The ML classifier also flagged this PDF with high confidence. The embedded URL, 'https://dafemum.ru/award?keyword=cambridge+english+for+the+media+pdf', is the primary indicator of malicious intent, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/award?keyword=cambridge+english+for+the+media+pdf In PDF document text
    • https://cdn.sqhk.co/febenanedibu/ajcLQqi/cheapest_flight_ticket_booking_app.pdfIn PDF document text
    • https://bebadivinokad.weebly.com/uploads/1/3/4/6/134604253/09368fd6c3.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/iisosjc/folk_rock_and_country_music_70s_80s_90s.pdfIn PDF document text
    • https://cdn.sqhk.co/wetiniwem/ijDQhcd/42878201886.pdfIn PDF document text
    • http://idealica-co.site/how_to_use_pampered_chef_stoneware_fluted_pan40com.pdfIn PDF document text
    • https://cdn.sqhk.co/wazofovam/ijibjil/60561693393.pdfIn PDF document text
    • https://nidabiweni.weebly.com/uploads/1/3/4/8/134865500/serazimukoxolugujif.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/obidkic/applock_fingerprint_pro_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/zetarizelub/biat2EV/93601390345.pdfIn PDF document text
    • https://mufuwavujove.weebly.com/uploads/1/3/4/0/134042856/piriji-rekuge.pdfIn PDF document text
    • http://1xbet-registrat.site/786809903438gegb.pdfIn PDF document text
    • http://usblighter24.site/11196348222p76o7.pdfIn PDF document text
    • http://ita-bio.space/kapuzumujirezoredurzgcw3.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/D7I6gds/2020_calendar_2021_printable_free_cute.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/tikofaketonub/d-link_dir-825_firmware_download.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/what_is_wings_of_fire_book_14_called.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/fetal_development_brain_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/how_to_heal_childhood_emotional_neglect.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/durojusebafofubitefaziseb.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/stat_gov_az_menu_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/bowmasters_windows_10.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_off0000cf43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF43 5500 bytes
SHA-256: 95ff0e752b891f300f67fa4c49e519f67e3337e26856ccf65f880529255f72dd
font_01_sfnt_off0000e1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BE 10264 bytes
SHA-256: 2add5d071d17989b9aef9c46763935efacef3e16d96618ef50cdaf7c75e3df3f

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