Malicious PDF — malware analysis report

Static analysis result for SHA-256 1739d9cf58177764…

MALICIOUS

PDF

81.6 KB Created: 2021-04-02 00:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 811da1f707164852352bd065f60fea9a SHA-1: a59f946a590f8a1655861462ffed23d635277a11 SHA-256: 1739d9cf58177764f49ce834cb42fbc2a49d294dccf258977c9fe238b1e63d1f
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically highlighted as an external URI. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing or trojan. The document body, though heavily obfuscated, suggests a lure related to 'how to answer the phone in English', likely a pretext for phishing or scamming. No scripts were extracted, but the presence of many external links points to a drive-by download or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/award?keyword=how+to+answer+the+phone+in+english+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476946/normal_5ffdcdce03fa5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380073/normal_5ff9d363d734a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393044/normal_5fd7d7bfd663b.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/trigeminal_neuralgia_review.pdfIn PDF document text
    • http://madalez.22web.org/tidixopezuvukagixudene.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_6063a8d2d3c4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419423/normal_5fd63820d453e.pdfIn PDF document text
    • http://rivuxini.66ghz.com/sony_vegas_pro_15_crack_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_605fea264e8ed.pdfIn PDF document text
    • http://vozobatenaw.mywebcommunity.org/xebosevifebejiwava.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/52bdd1dd-f524-4399-9ddd-8171f1e4504f/foxaxukokizobonuru.pdfIn PDF document text
    • http://guxejusoselota.myartsonline.com/ejercicios_resueltos_de_binomios_conjugados.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/midivufukagemotefes.pdfIn PDF document text
    • http://gewupitu.rf.gd/diono_radian_r100_expiration_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6bb2be-3a73-43ce-b0f6-d3c408b6d577/descargar_libro_el_reino_de_este_mundo.pdfIn PDF document text
    • http://temasabudig.rf.gd/99566761984.pdfIn PDF document text
    • http://tofilijewok.atwebpages.com/93276068189.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/what_is_the_best_app_for_lorex_cameras.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/latest_bollywood_award_show.pdfIn PDF document text
    • http://lunujebof.rf.gd/how_do_you_air_fry_chicken_in_a_convection_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff48c02e-0690-46e6-aaf1-f165c2552e14/mavonuruf.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_off00010094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10094 5356 bytes
SHA-256: 6349c23609300536624be3a8541dddd86d1b68243600f5313fbec0e268e3485c
font_01_sfnt_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 11160 bytes
SHA-256: 6c205c0921c79dc372d4b1ac72847e86dfca3188f27a4b76489c6a06fbf18ba4

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