Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ed4f33a91e47af…

MALICIOUS

PDF

101.6 KB Created: 2021-05-15 23:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a01b75300f20d0240d3f6cd4816d54f1 SHA-1: 56af00bbd7d5cdf8154574060464f07e0595544f SHA-256: 77ed4f33a91e47afd0da0e00e36f10b0ddf74ff621dba7c86e45f2fb39c39cef
126 Risk Score

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 0.9945

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://seumenha.ru/strik?utm_term=sri+rudram+miracles PDF link annotation
    • http://sujimelowakolop.medianewsonline.com/rukedixoviluros.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/levamojuzolenojepiluvebov.pdfIn PDF document text
    • http://mebovedu.getenjoyment.net/social_issues_and_environment_assignment.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/23zhh42/77654533217.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/vgiaXFs/amazon_alexa_apple_music_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/hi0zjd8/wajulelosugaxomutinoto.pdfIn PDF document text
    • http://espacecmb.xyz/favekegudetofazuxawame0squz.pdfIn PDF document text
    • http://asia.kiwi/engineering_mathematics_ken_stroud04xyx.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/bnhhhds/pound_cake_drake_sample.pdfIn PDF document text
    • http://triple-doska6.club/tuwopivekidajwifr.pdfIn PDF document text
    • http://uplrezina.site/7a-_8_crossword_answersf77z7.pdfIn PDF document text
    • http://jepewadagamer.scienceontheweb.net/rti_form_format_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/icLVimj/ultimate_werewolf_puzzle_game.pdfIn PDF document text
    • http://bewudewumit.sportsontheweb.net/jnv_admission_form_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_3e5e9abfe36b4b22bafd4b37c8fbf87a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15966c3d-d7fe-4fcd-b117-fb1d2f8c1f7a/4628579787.pdfIn PDF document text
    • http://naburonip.myartsonline.com/88149929302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fe5eb62-47b1-40c8-b220-bd97e10a41c1/northouse_leadership_book.pdfIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_b6d7f262a61e47c995c1bc618fbc0ebf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a5cf27f-a647-4751-9949-5cc5ca0461b7/95637676761.pdfIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_bfb3fa38507549bcaed0177857c0c2fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fabc618e-f406-4e27-9bbc-08c0c4053704/oster_french_door_convection_toaster_oven_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01f981bf-3aa1-4e86-9090-8a3ff19e1512/head_first_python_2nd_edition_free_download.pdfIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_e6c44c7ed339480e8a37f7d8af040f9e.pdf?index=trueIn PDF document text
    • https://82e7f058-9c2a-4352-8e65-a162d98cde11.filesusr.com/ugd/ba3c76_597088b724ce4c9faf82c3833e7907c9.pdf?index=trueIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/bodybuilding_program_for_mass.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14378 4772 bytes
SHA-256: fd3a3455420f293729410e72454d9adad19db8defc2e1790dde780f843757440
font_01_sfnt_off00015399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15399 11532 bytes
SHA-256: d42b77f8377fa73c3a77394326a351b0316021a9d50619ecce8ed93f3d0d4a52
font_02_sfnt_off00017aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AEC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378