Malicious PDF — malware analysis report

Static analysis result for SHA-256 111562a0d82654a1…

MALICIOUS

PDF

78.6 KB Created: 2021-03-31 08:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ab91952136f3199143878083bb62ad9b SHA-1: b427df587162a2467550e8f37337e58ba3f02dce SHA-256: 111562a0d82654a10ca8bc99e70673d79c635e4a5bf8da1c3f9a9d4457618959
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic indicating it functions as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/aws?utm_term=taco+bell+bean+burrito+calorieking PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485821/normal_600169a0b36e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503987/normal_5fd5f89d350cd.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/rjjdXii/90811587134.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/jhETIVy/84279660921.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/MNiheuY/beat_the_boss_4_hack_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404297/normal_602be2ae44fe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416786/normal_60461473a8a6b.pdfIn PDF document text
    • http://kigetipopizatij.getenjoyment.net/jedawigu.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/je1jeE5/6931130513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384318/normal_60446a1c2d9ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469143/normal_60336e8916ef0.pdfIn PDF document text
    • https://cdn.sqhk.co/pibilebomek/gjaFhrV/run_trailer_2020_hbo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_603e8442d911d.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/xufarotalanuduxojuz.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/luwijadol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451954/normal_6005c05d94b8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462096/normal_5ff771ae6c60a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460686/normal_60464cbee6f2d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mewabetowa.myartsonline.com/24911266446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22586e21-6b80-493d-9266-f1a001e9517d/fisher_price_rainforest_jumperoo_height_limit.pdfIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/contract_broiler_farming_project_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2abbca69-e3cc-4265-b11d-e19b6df39163/jozunupaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8e4c34-4451-4bee-884a-5afb74e3c219/dish_network_phone_number_customer_service_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9465c6aa-bd64-4710-8808-3a81d3f01021/yiruma_do_you_piano_sheet_music.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_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 4940 bytes
SHA-256: b12901299df694dc89b1728deeaf1483c7e5503ba887b064974d7682ccd9c5fc
font_01_sfnt_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 12208 bytes
SHA-256: 3706f5ea137539712df862ceb64ce7d6c49010783dfdb5801b73051f5344f7fb

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