Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c08e92e6064dbf…

MALICIOUS

PDF

71.9 KB Created: 2021-03-26 07:08:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 31ac60e5063f49524f02ea64823223e2 SHA-1: 944caeaabb5f3c57d3d6bfe7cc79f76c64a10f9f SHA-256: b1c08e92e6064dbfd32f8a4ea87648d6417864ef5745d7d7af30df3bcd073841
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 0.9990

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://baarspo.ru/wix?keyword=midpoint+and+segment+bisector+worksheet+pdf PDF link annotation
    • http://zemesod.getenjoyment.net/47852159826.pdfIn PDF document text
    • http://nifazafagikoxa.medianewsonline.com/ropedexasabikuwabidu.pdfIn PDF document text
    • http://podarokinsta365.site/codewarrior_64_bits_freef1aob.pdfIn PDF document text
    • http://zotikarida.medianewsonline.com/mogijotelikitowulujafoda.pdfIn PDF document text
    • http://zonuvak.medianewsonline.com/74896933755.pdfIn PDF document text
    • http://filmera.ru/45462583027wyppm.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/jeronodifokomor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/07888cb6-948b-4a07-9070-a15593e38584/tituvaxulolaxanodefalaja.pdfIn PDF document text
    • http://zogosugo.onlinewebshop.net/wegopeterijamira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01b6f84c-160a-4f8e-a194-5f01bde2b22c/vopebixor.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/25417120045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8b5f5d8-f138-49fb-a122-8524b9b7b50b/baligilizen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6dadcb3-fdbf-4a6f-98d5-f3bc731e38a2/2005_nissan_murano_for_sale_by_owner.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/websters_third_new_international_dictionary_unabridged_online.pdfIn PDF document text
    • https://76c87692-cca9-4651-be8e-de6412dad411.filesusr.com/ugd/fdad67_4c7f151a4d724fcab754f96345892e51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/filidabut/jakks_pacific_spy_net_night_vision_goggles_stealth_infrared_binoculars.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_5433beaa117b4950b329e9c6cae123a1.pdf?index=trueIn PDF document text
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_88d1a51a3e6341a1ad5a1925fcaa5586.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/andersen_bakery_calorie_information.pdfIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_702f06951726487d9498c1a45e625f76.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/pgcet_computer_science_books_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76dc3398-1bd8-450c-8bd0-d38c100422fe/nivipudenomovulibovefuvuv.pdfIn PDF document text
    • http://solugivewatewa.myartsonline.com/anorexia_nerviosa_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/all_coastal_landforms.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_9ae50a913e50407485cbec5f76d15741.pdf?index=trueIn 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_off0000dbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 5836 bytes
SHA-256: 341714b27665a13035dd066e87b31abc1052552f7402a83674cbe321afbd11ff
font_01_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 9968 bytes
SHA-256: dd511669e673f6eb75e149d041d4ca6bbbc4347d1b1c12939081f3dd3a98fb5d