Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8382e0d15e9084…

MALICIOUS

PDF

81.9 KB Created: 2021-03-31 21:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ef605253186c63b021ff4befdc1898a0 SHA-1: c6db23f0682b81f02b4795a2dd62d0e1bd47a620 SHA-256: 7a8382e0d15e9084362eb46be05525a8c9ac710f06f964d6a8aa6472ca34fa08
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious content. The primary URL, https://resalured.ru/strik, appears to be a phishing lure disguised as a search result for a medical query.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/strik?utm_term=what+causes+burst+blood+vessels+in+eye PDF link annotation
    • http://xitimudajejo.mywebcommunity.org/keludib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488809/normal_5fce5d443acb0.pdfIn PDF document text
    • http://lowabunuzoxa.getenjoyment.net/build_a_booty_workout_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/tirekidifole/adzjgiI/87927913274.pdfIn PDF document text
    • http://gawavapilasuvux.22web.org/balance_of_payment_components.pdfIn PDF document text
    • http://vizojuzoninunoz.scienceontheweb.net/zefonogunisifoju.pdfIn PDF document text
    • http://tinesemexogo.mygamesonline.org/axiomatic_probability.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494165/normal_603d7317249a2.pdfIn PDF document text
    • http://zunololanuxigu.sportsontheweb.net/effective_learning_strategies.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/7jbkMja/81661070759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481420/normal_5fdacfbf24d53.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/iajeFig/this_means_war_full_movie_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/g8d7ihy/road_trippin_lyrics_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/iggciaS/cara_chat_dengan_anonymous_chat_telegram.pdfIn PDF document text
    • https://cdn.sqhk.co/merojuniv/jeRheNp/29981261836.pdfIn PDF document text
    • https://cdn.sqhk.co/sofaxuleruri/RFfWf4p/411761228.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://revulagolorer.epizy.com/android_auto_whatsapp_not_sending_messages.pdfIn PDF document text
    • http://zerakunutage.epizy.com/warivudefubeg.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_2c14b328d83b41a58be83b8c4e51d3ad.pdf?index=trueIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_4f22e4635a794f1ab8a1005fee25e2e8.pdf?index=trueIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_1ee14ee405ad445ca9bc87f570cc6b08.pdf?index=trueIn PDF document text
    • http://zusunikumejimet.rf.gd/79535481007.pdfIn PDF document text
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_94e821d9958849ed812d1112e9b58050.pdf?index=trueIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_43a900b649bf42be96bd9a8e96798c3d.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_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 5344 bytes
SHA-256: 8b9dc8da5b0556d44efec5c6727ea0431f49818ab34e98db65786361bee11aa7
font_01_sfnt_off0001154f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154F 10680 bytes
SHA-256: 8d0ca8be4c92e8043a6bcc8a1576133ca4f7841031a8a76d700fd5b1759ffb51

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