Malicious PDF — malware analysis report

Static analysis result for SHA-256 526019cb4f60d358…

MALICIOUS

PDF

79.0 KB Created: 2021-03-21 02:17:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cbb102c90fdfcbd218adcb335afddd53 SHA-1: 14e173d6754828e4f4ec3a77dc9641c4d769628c SHA-256: 526019cb4f60d358879326ca95242dadbef3401ad95d42a2717bce2a314b7d83
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing or trojan variant. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('ponafet.ru' and 'scienceontheweb.net'), suggesting an attempt to redirect users to malicious content or download further payloads. The document body, though heavily obfuscated, appears to contain keywords related to medical conditions, likely used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/123?utm_term=arnold+chiari+malformation+surgery PDF link annotation
    • http://degifutuv.scienceontheweb.net/87384442059.pdfIn PDF document text
    • http://fituxem.sportsontheweb.net/lg_split_air_conditioner_remote_control_replacement.pdfIn PDF document text
    • http://dejamorije.scienceontheweb.net/amandemen_uud_1945_dan_perubahannya.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/how_to_remove_battery_cover_from_liftmaster_keypad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408993/normal_605579622a9a5.pdfIn PDF document text
    • http://rezolawanelu.sportsontheweb.net/banking_terms_and_terminology.pdfIn PDF document text
    • http://figokufo.iblogger.org/belajar_excel_2020_pemula.pdfIn PDF document text
    • http://vetebozo.mypressonline.com/bafekepadizipakarijopo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_6007503bdf2f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d3a092a6-6aba-4e73-b2ea-a476a70afb39.filesusr.com/ugd/84a5c6_593f128b30d4415f8bf40cdf92aafd81.pdf?index=trueIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_287a822c92ba4e6184ee975761e1d4b7.pdf?index=trueIn PDF document text
    • http://ludugatitabi.atwebpages.com/compndio_do_catecismo_da_igreja_catlica.pdfIn PDF document text
    • http://ginokaze.epizy.com/acog_guidelines_for_induction_of_labour_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/ponox.pdfIn PDF document text
    • http://vekabun.myartsonline.com/41906859033.pdfIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_4a55b04ba29a489085b3e2d53530a6dc.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_aec8a7b893784fff8c3695c8bc332188.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/84669842318.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_off0000f671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF671 5524 bytes
SHA-256: 4d2fc0540d4dded898def9527b5309ab47e8b4108462b7ff86e860119cc8ea25
font_01_sfnt_off00010919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 11052 bytes
SHA-256: a3cf88d5d13c0605952fd14441b0b2eab37b98ae8b24fc1eb9f60df348684bc5

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