Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd8ac924b6b95a3…

MALICIOUS

PDF

83.6 KB Created: 2021-06-08 04:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cb17709f76127f59aa9439281dc34e7e SHA-1: 23530f572bf5903da0eb4cc29fb82c4b453e6ef7 SHA-256: 2dd8ac924b6b95a3d0ae0bfbcc1efa9e69be2fbea80ba4cab5406805bcf0d749
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://baarspo.ru/123?utm_term=christian+bookmark+template+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369518/normal_600119a65d7ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_605c887ced8ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozixokumo.pbworks.com/w/file/fetch/144434811/dovivimefedoja.pdfIn PDF document text
    • http://zupelapowi.pbworks.com/w/file/fetch/144639843/mevokubufume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55efc62e-1aec-40f5-8258-8a88389fe0b2/english_new_book_for_class_9_sindh_text_board.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81f68c4c-8546-4d16-8ab3-42fe21ef7912/63209035142.pdfIn PDF document text
    • http://fujiserefi.pbworks.com/w/file/fetch/144591507/gidilolujisamadiwejab.pdfIn PDF document text
    • http://felefejimax.pbworks.com/w/file/fetch/144582540/satovup.pdfIn PDF document text
    • http://wuranosa.pbworks.com/f/fezobivozozomibil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a232f76e-3872-4962-852c-adec09359cc7/how_do_i_defrost_my_samsung_4_door_ice_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dec3dbd0-35de-44ba-80c9-f682833dcdac/vote_of_thanks_in_guest_lecture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb9518a-1d91-4441-a1c8-54619fd5bdd3/metodologia_de_la_investigacion_5ta_edicion_ao.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b178ac32-09b3-4d4c-8ae8-bc2ec3b57d61/74116932687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e448f5b-47d3-4be8-8f84-b83bbbb24199/fewafunatufoded.pdfIn PDF document text
    • http://degagogo.pbworks.com/f/83850615819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2607e3c-20fd-431d-a0e6-6493be364363/xipubunujokomigukipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ddb53d6-9a6a-435f-8583-30e9d8c4536d/timed_fluency_passages_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf8a45e9-f2b1-4a30-a984-df45050b646e/the_child_psychotherapy_progress_notes_planner_5th_edition.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_off0001093e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093E 5392 bytes
SHA-256: 5397fe51c3b02796e232b32ab12ea0ab7f05cc111775955512b337fb06f6a011
font_01_sfnt_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 11144 bytes
SHA-256: 1a522741c218b3be1dbf18d49c397fc054df9329de4af882dbe918de76c757a6

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