Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0f15e7d413d0d2…

MALICIOUS

PDF

80.4 KB Created: 2021-04-06 22:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d76403f487d761a5add5aea54f0481a3 SHA-1: 98c70cefff207df4c63cbf939e0302cf48a88f4b SHA-256: ad0f15e7d413d0d23cdb88c0c10c352917b937cc4580173765761b7ea0cbb827
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious sites.

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://vilenefex.ru/strik?utm_term=hundreds+chart+activities+for+kindergarten PDF link annotation
    • http://tryplafond.xyz/21460455861l3wkt.pdfIn PDF document text
    • http://vashmaster.info/50694320866i77d8.pdfIn PDF document text
    • http://joriwolujuf.sportsontheweb.net/enlaces_ionicos.pdfIn PDF document text
    • http://azakalaza5.xyz/line_6_floor_podf0xwk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_6037910e9b903.pdfIn PDF document text
    • http://xovuwowim.mypressonline.com/subject_pronoun_and_possessive_adjective_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454051/normal_5fe87cf53b006.pdfIn PDF document text
    • http://ribadubeko.scienceontheweb.net/curso_completo_de_guitarra_electrica.pdfIn PDF document text
    • http://pobadabodoz.scienceontheweb.net/veragukamis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491665/normal_600ea59786735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_604f331e266a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413973/normal_5ffb752783826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408993/normal_5fd33830ae4e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393761/normal_5fcebc2fc401d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451033/normal_6052182b1aa88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_017563f1d7494558a2c4c346c497c1a1.pdf?index=trueIn PDF document text
    • http://roporuti.onlinewebshop.net/19029040605.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_be5e71900388473296dafbeb9678d8cb.pdf?index=trueIn PDF document text
    • http://rogofideb.onlinewebshop.net/rugoxate.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/gijizegepaki.pdfIn PDF document text
    • http://rodexiguv.onlinewebshop.net/livros_sobre_pesquisa_bibliogrfica.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_off0000f951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 5336 bytes
SHA-256: c0371aaf841cd3bb671a3665a976c37b0012680168b2214afdf2e683adb877f7
font_01_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 11980 bytes
SHA-256: 6aaad565b95a2b6a9f599feadb26a2501c38f8e0168fd3e00537f147a1b21523

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