Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3647b2fdaac5ab…

MALICIOUS

PDF

79.3 KB Created: 2021-02-17 00:35:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a81c915798b05de4969e9c7a7b184314 SHA-1: 45411b8eca77f83d158a89ceeb82758a72074ceb SHA-256: 7f3647b2fdaac5ab511c0df75ccf7cf0f5e4da81422be6d1a96cf43884a7c3a4
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It utilizes SEO tactics with a misleading title ('Balaji tambe garbh sanskar pdf file free download in marathi') and embeds numerous external URLs, many hosted on disposable domains, to redirect users. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest this document is designed to lead users to malicious content, likely a second-stage download.

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://jottigo.ru/123?utm_term=balaji+tambe+garbh+sanskar+pdf+file+free+download+in+marathi PDF link annotation
    • https://suwudaxodorepe.weebly.com/uploads/1/3/4/8/134885248/9171731.pdfIn PDF document text
    • http://gramnews.xyz/sijakegudifedidifugefekoa9csj.pdfIn PDF document text
    • https://gegivibubijob.weebly.com/uploads/1/3/4/5/134507206/af84fbe695e.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/sudosapuwo-xuzupex-kodonube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403818/normal_600b4095720ea.pdfIn PDF document text
    • http://energierecrute-emplois.com/intermediate_accounting_test_bank5ad8i.pdfIn PDF document text
    • http://terem.space/roms_para_citra_3ds_emulador_androidtb84o.pdfIn PDF document text
    • http://workmonster.net/present_simple_exercises_with_answers_docuajvr.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/4231837.pdfIn PDF document text
    • http://gozatelaji.22web.org/vofovapidiwokolipexu.pdfIn PDF document text
    • http://blacktea.space/bully_pc_game_trainer_free76dfm.pdfIn PDF document text
    • http://formblckr1.xyz/kuzabagekoruse2gcy5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mewudupite.epizy.com/canon_eos_rebel_t5i_user_manual.pdfIn PDF document text
    • http://xedovafimolodem.epizy.com/aluminium_sulphate_msds_sheet.pdfIn PDF document text
    • http://dokozew.epizy.com/didaj.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_off0000e1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C5 2856 bytes
SHA-256: 8a9384bc512513f01e7bbd7e26df3f33c10457497f1237922838d3b841070303
font_01_sfnt_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 5876 bytes
SHA-256: 8e9be9d8ae9ea0832527623526b219e7284ec7e1d75d4420b925be1b8313bb7e
font_02_sfnt_off0000ffd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 15244 bytes
SHA-256: 6771c903728e5c28e166510c6da758d45abae5e925178933263959d4cf0bc2a9

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