Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31a75755b2d189b…

MALICIOUS

PDF

75.4 KB Created: 2021-05-01 15:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 664412f207f8656aa03a0b8ca421dcab SHA-1: 11cf198ab399fd89eaae9ed5584adc8e3784313f SHA-256: a31a75755b2d189b1093c1d3e83cfbe1f99bed4e8c81adcad41ef7712b58d1e5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically highlighted by heuristics as a link farm on disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=dna+the+double+helix+coloring+worksheet+answer+key+biology+corner PDF link annotation
    • http://tafugegajotu.mygamesonline.org/53034888736.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/mcdougal_littell_algebra_2_practice_workbook_answers.pdfIn PDF document text
    • https://gufekibeliwu.weebly.com/uploads/1/3/1/3/131382841/6551340.pdfIn PDF document text
    • https://dizivabuzazelu.weebly.com/uploads/1/3/4/0/134017784/vuxinal.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/81014544053.pdfIn PDF document text
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/8f6fa00.pdfIn PDF document text
    • http://vegoletox.medianewsonline.com/spreader_beam_design.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/static_gk_capsule_2020.pdfIn PDF document text
    • http://nanefelizili.epizy.com/baby_g_ba_110bc_manual.pdfIn PDF document text
    • http://gotenekopibijo.epizy.com/46221328897.pdfIn PDF document text
    • http://saboveliga.myartsonline.com/85148811773.pdfIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_c5c4233ad4bd469fb3e4c7820a05f033.pdf?index=trueIn PDF document text
    • http://jajiwolid.epizy.com/gcse_english_language_aqa_revision.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_033b795a33834f8eb601c421e7d250e7.pdf?index=trueIn PDF document text
    • http://suduxegowur.onlinewebshop.net/planet_of_the_apes_calima.pdfIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_ae6cf536f1d64963ab95f089cd88a8c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2126f291-841a-4fbe-85f4-ea069bcf3a0b/admiral_dryer_belt_routing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf1a6194-3ef1-47e9-8e4d-405f3c1e6790/theory_utility_jacket_with_shearling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52084f09-ee61-4e95-b3af-113a31174665/13271153494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cdb2241-a8c2-4912-b43f-736ff02e443e/jutaxadevalunaja.pdfIn PDF document text
    • http://nevabaza.atwebpages.com/zuvapukuwop.pdfIn PDF document text
    • http://gukutimaguvuzum.onlinewebshop.net/certificado_de_antecedentes_penales_afip.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_off0000e5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 5664 bytes
SHA-256: 594aa5b5fd53fb64e0c649c61c6b175ffcdacbbc253ea102a60963553dcc1f48
font_01_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 10848 bytes
SHA-256: 73e8196a2ca9edaa6369d16601bc2da7a606c1a3e1dc037978c36e693a676272

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