Malicious PDF — malware analysis report

Static analysis result for SHA-256 539cce8226269d74…

MALICIOUS

PDF

81.7 KB Created: 2021-02-20 22:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4230fb9fc4c70d1f31090b59db742fd9 SHA-1: a1cffb47fff9273a888dc45a02b698360af0844a SHA-256: 539cce8226269d749be80a2dec41bfe80011fd7d423b4148952eb703323f0a63
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The primary URL, https://maypoin.ru/strik?utm_term=blood+bowl+skills+nurgle+rot, suggests a potential phishing or SEO manipulation scheme. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=blood+bowl+skills+nurgle+rot PDF link annotation
    • http://libotopatolar.iblogger.org/ielts_writing_task_1_questions.pdfIn PDF document text
    • https://tumopododekup.weebly.com/uploads/1/3/2/6/132696021/wavuvafurusupim_wegirexonozowin_wabux_gidereguw.pdfIn PDF document text
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/kaweralulaxu_totesitibetop.pdfIn PDF document text
    • http://tokilekitikas.22web.org/python_bottle_request._forms._get.pdfIn PDF document text
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/xatuxevul.pdfIn PDF document text
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/b13b509.pdfIn PDF document text
    • https://pukexomupuko.weebly.com/uploads/1/3/1/1/131164185/foratunet.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/1709573.pdfIn PDF document text
    • https://moninedowilex.weebly.com/uploads/1/3/1/4/131436981/dd7d14539.pdfIn PDF document text
    • http://copyrighytsupport.com/11746362719rllss.pdfIn PDF document text
    • http://walkover.me/practical_enzymologymp0cn.pdfIn PDF document text
    • https://gilinolejokakis.weebly.com/uploads/1/3/4/6/134632374/dc215bf9a506b4a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuparol.epizy.com/phpspreadsheet_add_border.pdfIn PDF document text
    • http://zalaxorenisev.epizy.com/chitarra_romana_accordion_sheet_music.pdfIn PDF document text
    • http://nitesegu.epizy.com/zoviv.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/41530845327.pdfIn PDF document text
    • http://nanisoz.epizy.com/28586961343.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/basha_tamil_movie_video_songs_free.pdfIn PDF document text
    • http://zabukek.rf.gd/algebraic_fractions_worksheets_tes.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_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 5128 bytes
SHA-256: ccbe094f9f81cdd7623a8d438845685fbf74f7fb900433adda68d717b722ef36
font_01_sfnt_off000115e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E4 10476 bytes
SHA-256: 31c16bfa1ddfb6f4a0684df1aaff087a5c536c771501d0c078d468fe37ff4ca2

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