Malicious PDF — malware analysis report

Static analysis result for SHA-256 834e2909431ee0dd…

MALICIOUS

PDF

71.7 KB Created: 2021-06-12 06:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 21b5279afcd7aa3c2568332454625af1 SHA-1: 958efc12675353e0859cdb8ed36c241e2d18e3e4 SHA-256: 834e2909431ee0ddd925dcc0ed5e9db5c60f2b802b6cc26e685a5ac6f3f7eba9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary malicious URL identified as 'https://coretry.ru/pbw?utm_term=full+vishnu+sahasranamam+telugu+pdf'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using link farms on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://coretry.ru/pbw?utm_term=full+vishnu+sahasranamam+telugu+pdf PDF link annotation
    • https://wusukinepazewa.weebly.com/uploads/1/3/4/3/134372908/3fa2bd8e1683.pdfIn PDF document text
    • https://jolosusopafo.weebly.com/uploads/1/3/4/0/134097145/a725753e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_6048262b99e47.pdfIn PDF document text
    • https://zofodepeva.weebly.com/uploads/1/3/5/3/135318354/55b0c1adf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448113/normal_604dba9d23a89.pdfIn PDF document text
    • https://nemanuvipiza.weebly.com/uploads/1/3/1/3/131398236/42d2a654d.pdfIn PDF document text
    • https://joninotabuxid.weebly.com/uploads/1/3/5/3/135387421/gupeb_dofige_dukakozedozu.pdfIn PDF document text
    • https://rulukipa.weebly.com/uploads/1/3/4/3/134329123/sexilomoje_papefixexore_varibuwazeb.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
    • http://jozimatu.pbworks.com/w/file/fetch/145170285/convention_on_the_elimination_of_all_forms_of_discrimination_against_women.pdfIn PDF document text
    • http://lifuzopa.pbworks.com/f/1919_semi_auto_kit.pdfIn PDF document text
    • http://jedilukiwo.pbworks.com/f/37994930323.pdfIn PDF document text
    • http://zixereves.pbworks.com/w/file/fetch/144532362/zizoradukasogesav.pdfIn PDF document text
    • http://xizegopago.pbworks.com/f/300_instagram_followers_free.pdfIn PDF document text
    • http://dipoziw.pbworks.com/w/file/fetch/144440580/how_to_hack_zombs_royale_on_chromebook.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/89276419054.pdfIn PDF document text
    • http://ditatafomofu.pbworks.com/f/resident_evil_tamil_dubbed_movie.pdfIn PDF document text
    • http://fudejob.pbworks.com/f/pipabexujixenigevofasejat.pdfIn PDF document text
    • http://tarogifere.pbworks.com/f/relopubevuwirilemug.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_off0000cd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD76 5240 bytes
SHA-256: 388ab7efa536eb709d1978865f7921dd55b044b5ac359c2a655f7f4d1148488b
font_01_sfnt_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 10660 bytes
SHA-256: 5aeb44c0cf132f1d8758f8dc1ad80373f6b89340ba916e0a4e2f97c45b58015e
font_02_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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