Malicious PDF — malware analysis report

Static analysis result for SHA-256 20736299d1ca1f31…

MALICIOUS

PDF

67.7 KB Created: 2021-02-12 19:33:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ffd8bf80b27372dbb2e38c330a6d96a7 SHA-1: 44c99560ad7177545b00cb6f927653b8d4b873a9 SHA-256: 20736299d1ca1f316fedbbae9f857f4f7f3369e6a81c65e8eb6c87a00c661b67
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting it functions as a link farm. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the document's primary purpose is to redirect users to potentially malicious or phishing-related content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=the+cherry+fic+espa%25C3%25B1ol PDF link annotation
    • https://pumelagu.weebly.com/uploads/1/3/2/8/132814433/7457748.pdfIn PDF document text
    • http://zahlungsservice-ch.site/guvexoradt34gc.pdfIn PDF document text
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/6496790.pdfIn PDF document text
    • https://pisusafinado.weebly.com/uploads/1/3/4/3/134363103/6b09035ddc8.pdfIn PDF document text
    • http://natikolom.site/phpspreadsheet_array_to_sheet41gs7.pdfIn PDF document text
    • https://wimiberurazem.weebly.com/uploads/1/3/4/3/134351881/jifenedijofeno_fesawexizud_luvaraluzisizo_lufinuleg.pdfIn PDF document text
    • http://reduslim-ufficialesito.site/kala_bhairava_songs_in_tamil_freecayr1.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/womabum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411717/normal_5fee0e31e35ca.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/fanetamukokopog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465403/normal_5ffbe19948bbd.pdfIn PDF document text
    • http://hookup157.site/birthday_images_hdo4n3i.pdfIn PDF document text
    • https://dasasaperot.weebly.com/uploads/1/3/4/6/134665710/rakenonasatano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454041/normal_5ffb5cdada470.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://magotabitujotu.rf.gd/commonly_asked_job_interview_questions_with_answers.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_off0000cd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1A 5368 bytes
SHA-256: f8cc30735be937255f57d0b42fa5dd7904f05ca78924b179c92a6ca064ccdbe7
font_01_sfnt_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 9848 bytes
SHA-256: 226fe070d5d379d892c5b13e0d549a52df4e744b61bf66d5a79cee643b10a056

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