Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b14e196f4e9016…

MALICIOUS

PDF

80.4 KB Created: 2021-03-20 12:13:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aa3777d85464df9795c5b439b5d1e150 SHA-1: c8eec741c2dcffec8f1ccde65b2fd262c39b007b SHA-256: b8b14e196f4e9016875297ef19e70c7e1906e72eeee9f4595542ff039e1f6a2e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic firing for a PDF link farm. One of the primary URLs, 'https://golowaki.ru/strik?utm_term=what+to+eat+to+have+an+alkaline+body', is suspicious and likely leads to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. No scripts were extracted, but the overall structure suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/strik?utm_term=what+to+eat+to+have+an+alkaline+body PDF link annotation
    • http://ludivabuka.iblogger.org/sakumowukakekevolifope.pdfIn PDF document text
    • http://movikikigemalo.iblogger.org/ccna_security_lab_manual.pdfIn PDF document text
    • http://wokelegekak.66ghz.com/altinn_endre_kontaktinformasjon.pdfIn PDF document text
    • http://dujegud.getenjoyment.net/business_application_of_computer_calicut_university.pdfIn PDF document text
    • http://babitilakibo.mywebcommunity.org/coleman_6250_generator_parts_diagram.pdfIn PDF document text
    • http://rijexofugovu.medianewsonline.com/what_are_reactive_strategies_in_aba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/icsi_training_quarterly_report_upload.pdfIn PDF document text
    • http://nijarigu.onlinewebshop.net/85714198486.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/dell_ultrasharp_u2415_spec_sheet.pdfIn PDF document text
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_c9dd04a135f4483a8a2a6a656ae6bdde.pdf?index=trueIn PDF document text
    • http://fegidil.rf.gd/1382691106.pdfIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_659ce8d2bf224231bfe71faca4804090.pdf?index=trueIn PDF document text
    • http://belibivizonojo.myartsonline.com/astro_a20_headset_update_for_xbox_series_x.pdfIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_0ae8c250029d48f2981be344076c98b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/70281568741.pdfIn PDF document text
    • https://d4a58959-25bc-41ae-a48c-99f47e3c4711.filesusr.com/ugd/4dab1e_82bfba41415d4d3bb9338415c4b7c2c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/dijolewokenaz.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_ddb9cab90a5d4259968821e9b8ffdf0e.pdf?index=trueIn PDF document text
    • http://duvujod.rf.gd/sadalufijoxuxuboseg.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_2cd1cc91a2ae4be88ebe46bb77a21d4a.pdf?index=trueIn PDF document text
    • http://tuzufuwav.rf.gd/hp_laserjet_1536dnf_mfp_inkt.pdfIn PDF document text
    • http://befadiw.rf.gd/ujt_relaxation_oscillator_viva_questions_with_answers.pdfIn PDF document text
    • https://921790ca-7b53-43bd-a25d-275d6f056404.filesusr.com/ugd/9d24cb_2d4992b3440b42f2b9f84da0a425fb57.pdf?index=trueIn PDF document text
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_e337ada0678e45889a2b1d414ee46131.pdf?index=trueIn 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_off0000fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 5020 bytes
SHA-256: d955abc19d40c74d8223b91f10a25ab10da44618855956bac1dbbf6e740cbe8c
font_01_sfnt_off00010f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 10812 bytes
SHA-256: 275193cf5d2334e4c6295285c413f860c551c2a8b9d38c439e3fab1de7ae551a

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