Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff2d9e33dd3d628…

MALICIOUS

PDF

82.0 KB Created: 2021-03-14 16:58:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e86ca3b9447bedc59428111e4fc1102e SHA-1: 66318b58a43925587c9c0ab6e35171c16c7185b1 SHA-256: 8ff2d9e33dd3d628418d221e3d4ef9b58ff0434d5fd9bbec79942d15a1156deb
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many pointing to disposable domains, 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. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/award?keyword=terjemahan+kitab+bajuri+jilid+2+pdf PDF link annotation
    • http://lunesygets.xyz/6997387212021azb.pdfIn PDF document text
    • http://jiramowujunobo.22web.org/wezovukilagidoze.pdfIn PDF document text
    • https://wojatobarub.weebly.com/uploads/1/3/4/6/134612389/gixavemitokefafa.pdfIn PDF document text
    • http://mainsale.pro/guided_prayer_churchomeyowyh.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/kefep.pdfIn PDF document text
    • https://lijipipixeralof.weebly.com/uploads/1/3/3/9/133999964/4933253.pdfIn PDF document text
    • http://metoxegid.mygamesonline.org/formato_de_nmina_en_blanco_para_rellenar_excel.pdfIn PDF document text
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/a7c3c80ebd6.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/50600958727bzms0.pdfIn PDF document text
    • https://padixegidenu.weebly.com/uploads/1/3/1/1/131164435/mekitatu.pdfIn PDF document text
    • https://kexulisil.weebly.com/uploads/1/3/4/7/134762119/418e6a5.pdfIn PDF document text
    • http://trysoda.club/how_to_connect_my_plantronics_bluetooth_to_my_computerhlkp0.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/42781566816.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/8b3dc3c8-76fa-4f41-8f4c-4057a27e5a86/oracle_sql_dumps_for_certification_free_download.pdfIn PDF document text
    • http://xegiseko.epizy.com/kenmore_sewing_machine_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/evoked_potential.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f105444-4f57-48d2-b4bb-b614156a3ccb/85115434306.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/how_to_enter_cheats_in_gta_4_ballad_of_gay_tony.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/fuvil.pdfIn PDF document text
    • http://tunowik.epizy.com/39715514748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be62c399-bed8-4837-8872-c61651b3c7d5/rubaritalutidanefoteju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b26c14-0221-4ea2-aa23-9cf43017e54b/tropic_of_cancer_1970_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/54762771329.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/acid_fast_staining_procedure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caaf7d05-9a76-446f-aa19-23b8e8d276df/altered_carbon_season_1_episode_reviews.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_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 5464 bytes
SHA-256: 9aefb9754508be4257225457fe1f61633abc5c90d82beccaf44b4b0adcbc163a
font_01_sfnt_off000115ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EF 10888 bytes
SHA-256: 42dc7e8f6783153f3fec87299ac238053aa413df075571dcc0adfb3560cc35f9

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