Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ddf4a97bc29d29…

MALICIOUS

PDF

76.7 KB Created: 2021-06-02 13:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8a883ed760a944b145d0721f45ffbb14 SHA-1: 5b83d0a01dccaf378c4e7b78a558e24724f0981b SHA-256: 40ddf4a97bc29d2958cb479ef00799db875f9fcdaa720ba65f1b0e5e9b6dad74
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://inwebjor.ru/pbw?utm_term=how+to+download+aadhar+card+without+otp+in+tamil PDF link annotation
    • https://ridegagix.weebly.com/uploads/1/3/4/6/134668883/mekobeledolade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469617/normal_602f08b0905b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_600b27f45358e.pdfIn PDF document text
    • https://wexixumativedo.weebly.com/uploads/1/3/4/8/134865676/f96268.pdfIn PDF document text
    • https://xowedoditigivi.weebly.com/uploads/1/3/4/7/134714126/3bfdb6c877534.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/sipudilokupuxez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_5fd62a2508c14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_60579927a1bc1.pdfIn PDF document text
    • https://vegupixusenez.weebly.com/uploads/1/3/4/3/134318628/f9cbc3b68666cf.pdfIn PDF document text
    • https://kewalagaxed.weebly.com/uploads/1/3/4/8/134864879/nejukejazupewasipa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bujolajoxek.pbworks.com/f/mazikafimivegegenaxuki.pdfIn PDF document text
    • http://paderukut.pbworks.com/w/file/fetch/144443130/la_ilaha_illa_anta_subhanaka_inni_kuntu_minaz_zalimin_images.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/f/carmina_burana_piano_sheet_music.pdfIn PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/144500739/2165133247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecedbc9d-d41d-4e9b-9171-cafa1b36375b/titan_440i_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdf8a7df-88e2-42f7-9395-e825d21263f1/heart_touching_new_hindi_sad_song_cute_love_story_20.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/w/file/fetch/144420915/13267700894.pdfIn PDF document text
    • http://jobojifitin.pbworks.com/w/file/fetch/144449283/tefalobosufexiwibodaveg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf597752-2935-4637-8cda-1d04efc50c7d/45329145370.pdfIn PDF document text
    • http://ropotupi.pbworks.com/w/file/fetch/144502251/what_are_some_good_science_fair_projects_for_4th_graders.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/f/cuantas_filas_hay_en_una_hoja_de_calculo_de_excel.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_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 5188 bytes
SHA-256: 49da8f2332a96bf18a304a83ef6192b2f697f46c9ee98508d2971c83235f11e8
font_01_sfnt_off000102cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 10108 bytes
SHA-256: 2d968f8c51fc79a039ff403d588888da586e99aeaed8d9c46b27f1f912da3fa3

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