Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e2624fe10805e6…

MALICIOUS

PDF

76.0 KB Created: 2021-03-07 17:02:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 562e7ab7fb5b41fed139f0f50a417713 SHA-1: 997689853fc653ca2bd4889e00639c38a5ce845d SHA-256: d8e2624fe10805e67de930a299d7286ff4b509cd4178d1a5c469c6503edadb05
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI that redirects to a suspicious domain, identified as a link farm on disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The document body, though heavily obfuscated, appears to contain metadata related to a book search, suggesting a lure to a malicious URL.

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
  • 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://golowaki.ru/wix?keyword=inorganic+chemistry+4th+edition+catherine+housecroft+alan+sharpe+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419225/normal_602f6bb8e3c01.pdfIn PDF document text
    • https://bexavulurezil.weebly.com/uploads/1/3/0/7/130738929/fogivupukib-bekuzuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448116/normal_5fe3c9fef11f5.pdfIn PDF document text
    • http://arm-watch1.club/rti_form_format_in_marathile5gt.pdfIn PDF document text
    • http://irbestate.ru/how_to_use_garageband_to_produce_musicug4su.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/hjjgzd5/best_music_player_app_for_laptop.pdfIn PDF document text
    • http://usesalon.xyz/what_is_the_difference_between_dyson_v7_origin_and_motorhead5bjn3.pdfIn PDF document text
    • https://cdn.sqhk.co/jovuvufoxet/Tajbjia/gun_club_2_mod_apk_rexdl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371023/normal_602ffadb457e8.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/ggrQhcJ/banuxubinifiwekifujateb.pdfIn PDF document text
    • https://ruwawakutiro.weebly.com/uploads/1/3/0/8/130874672/botaxanalibu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370273/normal_5ffa5d46c137b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_602ea0559316d.pdfIn PDF document text
    • http://aires.fun/55677233274h38n5.pdfIn PDF document text
    • http://raisinshq.club/monarch_10_ee_lathe_for_saleiu1ay.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/duzexefemosaxe/what_is_the_average_salary_for_a_director_of_information_technology.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/linksys_velop_ac1200_review.pdfIn PDF document text
    • http://susabumo.atwebpages.com/how_to_study_the_catholic_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/52183233313.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/android_version_9_bluetooth_issues.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_off0000ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 5696 bytes
SHA-256: d0d0170e6f699ad5e59a64537a45abab010f22430f30a5e331fb04eb662d2a9d
font_01_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 10520 bytes
SHA-256: 5083d69c551836f5a0b652cf617c130c902c25026d1774181c11406fa953008d

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