Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3a4ffbdbec83ff…

MALICIOUS

PDF

76.3 KB Created: 2021-04-03 23:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3d9a2a896f981c3581d98d019f0572c5 SHA-1: 5ad6f585599f11e3eb6e17ee6fc3ab1f2f41cb5d SHA-256: ee3a4ffbdbec83ff35590e0595af755a079a90c937b305d801247be9e2b86633
134 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this, suggesting the document aims to trick users into navigating to malicious URLs. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/123?utm_term=codycross+answers+group+12+puzzle+4 PDF link annotation
    • https://cdn.sqhk.co/saligoliti/iaghMgg/51440407295.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/hbGZjcw/make_it_perfect_level_156_voodoo.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/chronological_order_of_jack_reacher_books_by_lee_child.pdfIn PDF document text
    • http://sewatumafuta.medianewsonline.com/system_performance_brendan_gregg_download.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/13077661347.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/RLUhhRe/6481374047.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/advanced_computer_architecture_parallelism_scalability_programmability_download.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/mesufapasatak.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/xurozivunuw.pdfIn PDF document text
    • http://kugewezebuvigiw.mygamesonline.org/vuzijiki.pdfIn PDF document text
    • http://zabovawupe.mypressonline.com/breakfast_club_full_script.pdfIn PDF document text
    • http://kimugifogetami.medianewsonline.com/dissection_of_frog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/viva_chicken_nutrition_information_arroz_chaufa.pdfIn PDF document text
    • https://c207dc97-0cc9-441e-8caf-a702c1639d46.filesusr.com/ugd/36abe8_cf33555609f04b7fa9a43c95475b957c.pdf?index=trueIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_3464ac9fa4294396a08200a2e5978734.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/selugujugigig.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/827471174.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/wapezadevizofovozowop.pdfIn PDF document text
    • http://dezinolabebosod.atwebpages.com/56955104461.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_ae08d02ce0bd44208602dca7218ba1ce.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_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 5660 bytes
SHA-256: 14640a33c7ad0c7d80d9e66072940192fcce05bb067403def65515fb8b211a74
font_01_sfnt_off0000ff65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF65 10796 bytes
SHA-256: 1185538b9cd982496749938655d83e8516e67220d7872ab5dd26d48b4022aa9e

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