Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e46c93b33d07912…

MALICIOUS

PDF

161.7 KB Created: 2021-04-06 08:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e91dc0a7fa1c603c738710a2cb8fec5b SHA-1: 46c8a41830113874de116a7f6ac0ecb5df593a68 SHA-256: 6e46c93b33d079123f398f8c47a20fb55944dacc2f529b8367f3ef353439e53b
126 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and has been flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URL, 'https://zajinet.ru/123?utm_term=android+studio+install+gradle+3.+0.+1', is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains references to 'Android studio install gradle 3.0.1', suggesting a lure for software developers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/123?utm_term=android+studio+install+gradle+3.+0.+1 PDF link annotation
    • http://shishkin-seed.xyz/how_fast_does_a_125cc_pit_bike_go_in_mph9fddh.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/ihijbge/idle_legend_facebook.pdfIn PDF document text
    • http://durowan.sportsontheweb.net/clipsal_ceiling_fans.pdfIn PDF document text
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/jiborugikud_falodabiwubifup_wibogexaw.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/8941667.pdfIn PDF document text
    • http://nekidifuton.medianewsonline.com/volep.pdfIn PDF document text
    • https://nakagikirowi.weebly.com/uploads/1/3/2/6/132695306/cac3414.pdfIn PDF document text
    • https://bipixivosebik.weebly.com/uploads/1/3/4/5/134516267/3094b39205.pdfIn PDF document text
    • http://ginupedarokuxu.getenjoyment.net/ditaguxemafewazijutitupar.pdfIn PDF document text
    • http://tediwaxivuj.sportsontheweb.net/uses_of_a_liberal_education.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://151dec52-cf20-477b-a401-a68195eead79.filesusr.com/ugd/8538f4_e18b2de35c36481c9570f685ed88c6ca.pdf?index=trueIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_29ee9b8658f64ce6a3a9ebf475f134e0.pdf?index=trueIn PDF document text
    • http://forezepolutaju.onlinewebshop.net/67578627158.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_7324f457952c4c9a94e94ce652a84e65.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_810af0dadea24b41806bc5f892d15060.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_8f0d95adfc7b468898bf2dfadd485ccd.pdf?index=trueIn PDF document text
    • http://wobanunep.myartsonline.com/simple_present_tense_for_beginners_exercises.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_off00023d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D4E 5372 bytes
SHA-256: cf1ef88f5ab454c0ee43df6992aa09902b291a908390fd58c4667bab98a49595
font_01_sfnt_off00024fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24FA3 12312 bytes
SHA-256: 6d8c2ddc41c7f4871f674e2b88740739f4652baea51c3a0415d709fcafd2dac3

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