Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d7c3eb6bd50da8…

MALICIOUS

PDF

80.6 KB Created: 2021-03-19 07:46:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1cce8690cfdb9853db6f232f31ee7457 SHA-1: 0df503235980499e53224ffa35e56bc859d83b30 SHA-256: 52d7c3eb6bd50da85142e56c811457591b62f197d9beffe4cf22026f3a87dc46
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a mass of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=film+genres+listening PDF link annotation
    • https://cdn.sqhk.co/guzunilepin/ij0vRbG/history_great_battles_medieval_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491437/normal_5ffd7de645eca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470825/normal_5fec3851221a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471253/normal_602ef2a857209.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370762/normal_5fcbf40b75714.pdfIn PDF document text
    • https://cdn.sqhk.co/kinerufi/ThhiOQ0/streamelements_alert_sounds_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_6045063248c52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416659/normal_603ccd0f261e2.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/7inii2r/luleworawikufovurakata.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/jjiepRi/deses.pdfIn PDF document text
    • https://cdn.sqhk.co/satijumok/wghjfFA/ball_blast_game_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486775/normal_6049d356c44ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_603ffc21cde7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_6011f6b55c7fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446152/normal_5fd0aad5ce1b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_afb3487ae3cb418890725f6e2ebe8f9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be06852-7af9-49c4-9db5-5861a0ed553b/24049389548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0777f917-5f85-43ea-a496-a445ce1742af/91594324062.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_1cf0226f808348968736b057e8e4ca41.pdf?index=trueIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_d262138cb9aa4ae281caca6d224876b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dosipive/87783521036.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/skype_sign_in_without_microsoft_account_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4009f2-4ba9-4985-b321-b5cff5442c47/elenco_de_tres_metros_sobre_el_cielo_2.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/36409844820.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_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 4748 bytes
SHA-256: 6ff36ffe3712013f02614f7e583f5d46756d9a15146406fa7e1c4423da4e9a08
font_01_sfnt_off00010fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 10860 bytes
SHA-256: 90e8ffb51e722d3f9f6e651e81c9ef2b54ebda53725d975fa4aebe6f7718e929