Malicious PDF — malware analysis report

Static analysis result for SHA-256 990cbc4c05412dfa…

MALICIOUS

PDF

77.1 KB Created: 2021-06-11 11:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f2dc3a4f00c89cee9ca55708c5e8ac73 SHA-1: cd2f454a9b1b935ef1f32f790fa97a4a216a0d5b SHA-256: 990cbc4c05412dfa77a2dc05c571379ac9c66945d6f71bfc604f54be443e7cf2
174 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a Windows activator download. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to decrypt an archive, a common tactic for evading gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/pbw?utm_term=windows+8.1+build+9600+activator+kmspico+download+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475864/normal_5fe9a8ca04932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482849/normal_60c144647ef16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_605662d222ed8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_60304adf23d1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419623/normal_6056721de453e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480753/normal_60168c1f109d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_603f48b80f33e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392873/normal_605c5369dfa9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501996/normal_6051ee8d5a9e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/59ce067a-b045-4514-a1d7-beffab713c9a/zizujabogusevonikigit.pdfIn PDF document text
    • http://wekibivu.pbworks.com/f/34171247666.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/w/file/fetch/144628974/income_tax_return_form_in_excel_format.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144419802/how_to_check_online_nikah_nama_in_pakistan.pdfIn PDF document text
    • http://fagimox.pbworks.com/w/file/fetch/144496686/cuanto_mide_un_metro_cuadrado_m2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d91a7e06-49ae-4633-88b1-851e426846ae/rockwell_versacut_saw_blades.pdfIn PDF document text
    • http://mevuteled.pbworks.com/w/file/fetch/144618762/tolerancing_and_fixed_reference_points.pdfIn PDF document text
    • http://kutegazez.pbworks.com/w/file/fetch/144826884/strike_force_heroes_3_unblocked_google_sites.pdfIn PDF document text
    • http://wafijovodek.pbworks.com/f/convertir_imagen_en_word_editable.pdfIn PDF document text
    • http://wisarazed.pbworks.com/w/file/fetch/144466845/zobezidirat.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/f/44159371924.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/f/lagefinavigovoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faa9f9b1-6147-4b16-b22a-7f9491f3bc9c/kabarum.pdfIn PDF document text
    • http://wirajudukim.pbworks.com/f/dojelig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7fe6a3e-a70a-4869-b742-f4b7d347ff36/remiwiveri.pdfIn PDF document text
    • http://detomipipu.pbworks.com/w/file/fetch/144584142/49841006602.pdfIn PDF document text
    • http://gajufabeke.pbworks.com/w/file/fetch/144861198/wobivokidalelafamopizo.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_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 6400 bytes
SHA-256: c071a18586bb66024f590645337a77dec7ed664316f81e40e1a9ec084c9264ca
font_01_sfnt_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 10356 bytes
SHA-256: 5d8b66b4e7bf26971f6a8ad5ae02dadca813331dbc434f8dd56a1147d5df2587