Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9bf008966bfbd61…

MALICIOUS

PDF

74.8 KB Created: 2021-03-26 09:31:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: df9aaf5033bf913fff9042a987cf5e63 SHA-1: 18ee11b9186f97fa71d309a9e61873638b2b6976 SHA-256: d9bf008966bfbd611aa8458dd42813320b0bab162d695dde19d93308191a37d7
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism to a malicious site. The document body, though heavily obfuscated, contains references to 'Mitosis lab answers' and the authoring application 'wkhtmltopdf', which could be part of a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/wix?keyword=mitosis+lab+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384652/normal_600e5c3bac306.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391925/normal_5fc7d3a63add1.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/ihuszjL/zirikofikaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372960/normal_5fcf982bd84ed.pdfIn PDF document text
    • http://gemajelibetojup.scienceontheweb.net/amylose_vs_amylopectin.pdfIn PDF document text
    • https://cdn.sqhk.co/tagodepa/ihj4hge/bandicam_vs_obs_studio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5fe7a18a07e71.pdfIn PDF document text
    • http://retapobu.iblogger.org/guidepost_solutions_limited.pdfIn PDF document text
    • http://retoxen.mypressonline.com/jssc_recruitment_2020_notification.pdfIn PDF document text
    • https://cdn.sqhk.co/povuguzuloga/ghT3Li3/download_assassin_archer_modern_day_robin_hood.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_60405900e4355.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366319/normal_5fe532f549c8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406208/normal_6031bc0c9d385.pdfIn PDF document text
    • http://seplafond.xyz/1st_birthday_party_planning_checklistjrd2l.pdfIn PDF document text
    • http://silkhfig.bid/pasigezaxejodiruvuwamezam82120.pdfIn PDF document text
    • http://tubipiguposazi.22web.org/unity_vs_game_maker_studio_2_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/gLBEgh8/11024524734.pdfIn PDF document text
    • http://pojitutujux.22web.org/asciidoc_examples.pdfIn PDF document text
    • http://sreda.city/gnostic_book_of_changesdu16p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fepusum.onlinewebshop.net/langston_hughes_the_weary_blues_poem_analysis.pdfIn PDF document text
    • http://sufekowanak.rf.gd/64761038039.pdfIn PDF document text
    • http://pukisutubog.rf.gd/50627885964.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_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 4916 bytes
SHA-256: 08e929268c4ad7f10183ecf314c739b2212ba9bf00523782b3e7b2cab4757393
font_01_sfnt_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 10832 bytes
SHA-256: bba52e01c7f223bcb4e80f62d4edf21fa6345e540f984b162149e7c7988a6e30

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