Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd6c643a93d85c1…

MALICIOUS

PDF

69.4 KB Created: 2021-02-27 22:55:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: aed3137d5592245dfb6bc86cd0611500 SHA-1: 4826bdd6a2d001116db3ce6582588bb676b7cb84 SHA-256: 5fd6c643a93d85c1c0842ff1a1d598574c6bfe5986fd3078d93b7020943fbc8e
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 domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://maypoin.ru/wix?keyword=molecular+cloning+a+laboratory+manual+1989+pdf PDF link annotation
    • http://rubeatyshop.xyz/cnbc_reporter_europetw6fi.pdfIn PDF document text
    • http://vizit.store/initiative_1_students_book_macmillan3zmyl.pdfIn PDF document text
    • https://cdn.sqhk.co/kesokirow/jeifhfZ/download_game_basketball_stars_mod_apk_versi_terbaru.pdfIn PDF document text
    • http://krokoboko6.xyz/job_hunting_ielts_listening_answerswho2l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409110/normal_6036a4da6a256.pdfIn PDF document text
    • http://luminar4-download.xyz/9204955851511t2o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418786/normal_5ff4e4905aef7.pdfIn PDF document text
    • http://leafester.online/fugue_g_minor_bach_sheet_musicb5bte.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/2_examples_of_tragedy_of_the_commonsfnrqr.pdfIn PDF document text
    • http://meriline.store/dozinarimepovezepovoj36ldd.pdfIn PDF document text
    • http://theplafond.xyz/mapeteg27f3.pdfIn PDF document text
    • http://swiss-family.space/metodo_de_trapeciosxv5ie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_602731bc2eb89.pdfIn PDF document text
    • https://cdn.sqhk.co/pofoxubo/jjgnih8/stonies_near_me.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/tawovojo/jejumofabovi.pdfIn PDF document text
    • http://tasopawak.rf.gd/birthday_chocolate_cake_photos.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/nutritional_information_portabella_mushroom.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/android_10_samsung_note_10_update.pdfIn PDF document text
    • http://wuzugimekiwetad.epizy.com/45716263720.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_off0000d0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A0 5948 bytes
SHA-256: 6d89c393814a632cd53ef0eb26c458412303b2be34aeef06f1601538332ae63e
font_01_sfnt_off0000e4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DE 10348 bytes
SHA-256: 2cdce12603e087c48dac1b37fbc7dd5da635786b401b4447a2acb950c015da9b

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