Malicious PDF — malware analysis report

Static analysis result for SHA-256 05eff76f0613c690…

MALICIOUS

PDF

86.4 KB Created: 2021-05-17 12:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9f2a7af7260becf94f40c4a6c99a1cff SHA-1: 20062c2830accde497eb1a5aacc2655d8082c9e7 SHA-256: 05eff76f0613c6906d896c35839566bfb71b907f6a47c4b716dfe4f806689b55
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the presence of external URIs suggests an attempt to redirect the user to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://botokaw.ru/strik?utm_term=angle+addition+proofs+worksheet+answers PDF link annotation
    • http://custits.space/82941082073gzrph.pdfIn PDF document text
    • http://rafewasugajeze.22web.org/90428281259.pdfIn PDF document text
    • http://euroshopmn.space/giancoli_physics_principles_with_applications_7th_edition_solutionstd5ue.pdfIn PDF document text
    • http://doresal.22web.org/martin_luther_king_i_have_a_dream_complete_speech.pdfIn PDF document text
    • http://easterthjg.com/3776795878947u70.pdfIn PDF document text
    • https://xuvevajepew.weebly.com/uploads/1/3/0/7/130739459/digapam-vavajivokiwil-rijewodogeli.pdfIn PDF document text
    • http://fortuneo-enligne.com/echo_weed_eater_string_stuck_insideyrbwi.pdfIn PDF document text
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/vinulubikurigugi.pdfIn PDF document text
    • http://dress-russia.ru/car_racing_club_namesgmc0b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mifijikamipupu.epizy.com/smartsheet_control_center_app.pdfIn PDF document text
    • http://vonizevugopu.rf.gd/singular_plural_exercises_with_answers.pdfIn PDF document text
    • http://xebikegami.epizy.com/8198445469.pdfIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_663b7f13d5a3431aa5d7cffcaeab0a27.pdf?index=trueIn PDF document text
    • http://kaxixuzebupajal.epizy.com/pesodizixepuwiv.pdfIn PDF document text
    • http://bulifebebavub.epizy.com/balanced_diet_lesson_plan.pdfIn PDF document text
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_38c26b5486a044348682f5b4f2959772.pdf?index=trueIn PDF document text
    • http://wegojokudevepo.rf.gd/84747290255.pdfIn PDF document text
    • https://4f870d4f-701c-4ec6-bbb3-7277acc5528a.filesusr.com/ugd/fdcb8d_8341d6a71935469c839a351371190a56.pdf?index=trueIn PDF document text
    • http://gepikadagutuv.epizy.com/fomisuzur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c77a9262-1de5-46ac-8704-a1fad9de1560/gisojujepileba.pdfIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_0040ead4845647abb9633dd99bb39212.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1db1496-e96c-486f-9525-938e770cde47/19939540000.pdfIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_9f563ce035b0487e8bf75ac081824cf6.pdf?index=trueIn PDF document text
    • http://totaraxidob.rf.gd/vavub.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 5448 bytes
SHA-256: 54c043fd26f20307bdf3bd2fef2fff28276657baaf1578127de0db0ae49c895a
font_01_sfnt_off000110f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 11252 bytes
SHA-256: 9f55faac5a05772ff8fb7c9ddedfdd49eda59701814c1c26770472d8ddb0b775
font_02_sfnt_off00013701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13701 16072 bytes
SHA-256: 4ce97752c8d1ed0b0302a1507788019c6b738cc3ee96ca273f61f92c287db7cd