Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a7f6c05a113f3a…

MALICIOUS

PDF

80.2 KB Created: 2021-03-22 05:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: de7d568e5d90355c9ea94c67a362bbb9 SHA-1: bd1b868fda43138d62acff7308a028941ce9011d SHA-256: 27a7f6c05a113f3ac8f1967195023b9db2649aba0c4d1d15216d2b92579b6f37
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, including one to 'ponafet.ru' which is flagged as a malicious URI. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or scam operation. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ponafet.ru/strik?utm_term=how+to+work+a+butterball+turkey+fryer PDF link annotation
    • http://bomudomi.iblogger.org/50720383262.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/sig_sauer_p320_40_extended_magazine.pdfIn PDF document text
    • http://prizinsta365.site/sauder_computer_desk_with_hutch_assembly_instructionsr3zc5.pdfIn PDF document text
    • http://amst-watch-v2.club/pawogixavetumuwic0zbf.pdfIn PDF document text
    • http://lazadacostumercenter.com/126768593044zpfq.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/how_to_train_your_dragon_collection_bookswks9n.pdfIn PDF document text
    • http://pressit.space/columbus_day_worksheets_4th_gradebhuo9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_d8db36f329be407584b40b0559eb5a4b.pdf?index=trueIn PDF document text
    • http://pivimufe.atwebpages.com/nursing_diagnosis_book_free.pdfIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/que_tipos_de_funciones_existen_en_matematicas.pdfIn PDF document text
    • http://nekelaxowe.atwebpages.com/mechanical_engineering_technician_salary_ontario_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de01092b-7f95-44bf-a2bb-b75fd58b7e6d/what_of_this_goldfish_would_you_wish_yonatan_character_traits.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_bc16af66de78436c9fa802e575a1b1c9.pdf?index=trueIn PDF document text
    • http://bugenerefajujus.atwebpages.com/handbook_of_statistical_analysis_and_data_mining_applications.pdfIn PDF document text
    • http://samesesodore.onlinewebshop.net/4298521968.pdfIn PDF document text
    • http://xidalagep.myartsonline.com/4055952583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20358650-d095-4bd1-a45b-447ff2694abf/83946169200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a501f4e7-8a1a-4498-9d23-5e999b56f48b/how_to_cite_a_legal_memorandum.pdfIn PDF document text
    • http://gixogofano.rf.gd/sukaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 4668 bytes
SHA-256: 7f23f8ca64683037e19afd0c23dd188163d8163661833203961109bb478daa01
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 10868 bytes
SHA-256: 8a10e3d70de0b0aef73aa272d2d67dcb0c827936d8b4ff32e470aa724c5a2229
font_02_sfnt_off00012400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12400 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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