Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2e654bc5b54eac…

MALICIOUS

PDF

80.0 KB Created: 2021-02-16 23:59:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ea15dbb5cda9436449693e1c0c957092 SHA-1: d8d7fc933c5c22c9fa16582d4b7126d513cf5829 SHA-256: db2e654bc5b54eace543b40fc4e17a10b818ebbf666845a9dae6df5f03a49f18
136 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly support its malicious nature. The primary IOC is the redirector URL used in the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=dexter+cattle+pdf PDF link annotation
    • https://cdn.sqhk.co/zujumatatub/6ibLMib/css_style_button_inside_div.pdfIn PDF document text
    • https://cdn.sqhk.co/murefazomejo/qjgjho3/todewovarapiku.pdfIn PDF document text
    • https://cdn.sqhk.co/mozoposowi/jael4hd/nibanixikor.pdfIn PDF document text
    • http://vvinorama.website/stairmaster_run_cube_surfing_gameslkl1y.pdfIn PDF document text
    • http://zumbayuliya.online/ia_maron_calculus587vm.pdfIn PDF document text
    • http://espaceabonne.com/xoziditekomuman18i93.pdfIn PDF document text
    • http://topuniversityru.fun/lidivodafojejitesesiku481rm.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/5rWSgiL/tech_deck_skateboarding_game_play.pdfIn PDF document text
    • https://cdn.sqhk.co/pagupuxu/cjjIqij/nintendo_3ds_gold_edition.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/kavifunaruvi/ziwosul.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/sabrina_claudio_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/the_marine_hymn_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/wisabewiwuvuduwig.pdfIn PDF document text
    • http://vojulemopo.epizy.com/44975170897.pdfIn PDF document text
    • http://dolafesa.epizy.com/whatsapp_apk_for_blackberry_os_10.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/w_o_d_full_form.pdfIn PDF document text
    • http://puteruwegadijem.epizy.com/gizulugijesek.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/kmart_fitted_sheet_sets.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_off0000fe74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE74 5040 bytes
SHA-256: 7dd0e5f73658fe2585dd68cc0c6d2933a419f2b2fa0b611fd8ad9c3eb3e9a7e1
font_01_sfnt_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 10292 bytes
SHA-256: 84e19c15586f1cc77208d2c017aec02d4267ef1b85d27799275254ab9b5f10c2

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