Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcf0102074a5d67…

MALICIOUS

PDF

78.3 KB Created: 2021-04-21 04:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9ecdf88b372209614c47bf4cd9f7c938 SHA-1: 2158d83631d72c34f4c17174e9c846054b19faa2 SHA-256: 4dcf0102074a5d67cb46295b2bca1859db106e17d1b6ecd3966d8244654bd018
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a significant portion hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/strik?utm_term=what+streaming+service+is+news+of+the+world+on PDF link annotation
    • http://a1metromovers.com/hidden_oracle_seriesoxlsd.pdfIn PDF document text
    • http://copyright-services-us.com/wonojapeviwajizsw3cp.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/hcggG7Y/playroom_organization_furniture.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388612/normal_5fdc3d276d2b9.pdfIn PDF document text
    • http://finansi-7.online/libros_de_matematicas_universitariasqn41w.pdfIn PDF document text
    • http://parrrtner.xyz/musewodesemasopidumuvey5c2w.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/a8gi0F6/21938064552.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/jeXhhwU/top_new_ringtones_only_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413718/normal_5ff28c3ad06fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471091/normal_601b8b473b3cf.pdfIn PDF document text
    • https://cdn.sqhk.co/zipodumup/b6EJ9jf/sniper_3d_mission_everybody_hates_jim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_6061cf33bcbe1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pavogojewef.rf.gd/report_bug_facebook_app.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/romipunoxividigonararomum.pdfIn PDF document text
    • http://koluriv.rf.gd/gk_question_answer_in_english_2020_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/power_episode_guide_season_3.pdfIn PDF document text
    • http://romuwoturifitam.epizy.com/79167784136.pdfIn PDF document text
    • http://kezaforow.epizy.com/mbamission_insider_guides.pdfIn PDF document text
    • http://nejoluf.epizy.com/cereal_box_project.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/answer_my_math_word_problem_free.pdfIn PDF document text
    • http://zonozemonubul.epizy.com/xubitunivowafuwawut.pdfIn PDF document text
    • http://nosudalivuza.epizy.com/mathematical_induction_exercises_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/suvin.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_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 5600 bytes
SHA-256: da75e423cc8b0ae84d8187b69b5bffe04cd209cdf2048260d54477b8699f6b93
font_01_sfnt_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 10808 bytes
SHA-256: d7f9b4047162ba3c9ccbd9c935a2095dc13939da869c5193c1c7db06ea97472d

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