Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ce66deae274537…

MALICIOUS

PDF

73.5 KB Created: 2021-06-06 21:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bed9cbf45eb6a9154f6ba6a10bca6eed SHA-1: 042709037de01cde65840e1af8fb196c00bcc245 SHA-256: 36ce66deae2745375b3f3f08efa473c7c12e0b4179903948e8b5845d942c0b30
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF structure are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://pixomot.ru/pbw?utm_term=alex+rider+scorpia+rising+book+review PDF link annotation
    • https://nibiromevisike.weebly.com/uploads/1/3/5/2/135299411/f8a680164.pdfIn PDF document text
    • https://webojugobe.weebly.com/uploads/1/3/4/6/134601542/dedegev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421061/normal_60018ecf6de6a.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/kularazif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380209/normal_5fedb8ef86dce.pdfIn PDF document text
    • https://xibutunu.weebly.com/uploads/1/3/4/0/134017024/2019112.pdfIn PDF document text
    • https://getomipo.weebly.com/uploads/1/3/4/4/134403721/daf46.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/53b0628e-7d7d-4d12-92f2-1dd0357753b9/nirujel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad5eabf-bc84-434e-934a-a08a1dd081a5/how_to_get_a_ssa_1099_for_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c4d2e11-aa40-492f-8901-16803f39affd/jugijivipofisupofapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1904e181-ab63-4d3b-bd3f-76383ecfdbb2/winevuketesi.pdfIn PDF document text
    • http://bevojoluvu.pbworks.com/w/file/fetch/144447549/32360427428.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/f/how_to_fill_employee_declaration_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0128b0b-22f2-4624-8047-a5bb62569212/12585189368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c21a1302-a6bb-49c6-85a0-e82640551977/pippin_piano_score.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/norabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f07f12-3a81-44ab-a6c9-fb2419e32119/47494321063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ae26467-bdbe-45c5-9d86-51d422e238ff/navsea_technical_authority.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_off0000e27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 5652 bytes
SHA-256: 2982d2772164a0598ccd4a61112f4aef416c5586613d2c9e5f33e1cd8295b747
font_01_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 10176 bytes
SHA-256: eea14a9fb8be1841aa77747f5eed02aab45d9e08c79a18fa926ef007357248a7

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