Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b1dd006a85db45…

MALICIOUS

PDF

75.8 KB Created: 2021-06-13 09:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f52704da344d582e419557cb5f777e59 SHA-1: 045b2b34784332563b027cf1d22c20efaf476623 SHA-256: f1b1dd006a85db45966750417b537b102fdf2d7e3fc5cd25b4d4e29e6a77131e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to lure users to malicious 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://catamma.ru/pbw?utm_term=moral+stories+in+telugu+pdf+free+download PDF link annotation
    • https://vebamumu.weebly.com/uploads/1/3/4/7/134730259/gajaje.pdfIn PDF document text
    • https://senuwisaf.weebly.com/uploads/1/3/4/0/134018119/rufexavogowifoj_sagavuzedinife_jexejag.pdfIn PDF document text
    • https://gepidoduxaw.weebly.com/uploads/1/3/5/3/135324144/nukixixekazile.pdfIn PDF document text
    • https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/lojusemojopuruwi.pdfIn PDF document text
    • https://gusobukenifoku.weebly.com/uploads/1/3/4/5/134525986/fupefepuvesor.pdfIn PDF document text
    • https://ruvawigalovenu.weebly.com/uploads/1/3/4/3/134318686/sexutotig-zobuwekadeda-panezebezu.pdfIn PDF document text
    • https://vabusise.weebly.com/uploads/1/3/4/3/134385335/fonujoriwes.pdfIn PDF document text
    • https://junadiger.weebly.com/uploads/1/3/4/6/134639337/kirogugerup.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/fabe2e47-6c4c-418c-842c-68de88c3b18e/vazumukapudososudokudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5054572-03bb-4ff0-a081-36a655800b10/04.09_understanding_satire_worksheet_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80464113-891e-47d7-94bd-6a6c5b594261/34369355056.pdfIn PDF document text
    • http://vazesuna.pbworks.com/w/file/fetch/145173915/glencoe_biology_teacher_edition.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144818583/levevisonaluwepasodixogeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea3c0b8-e034-431d-bd12-ed3e7f77cac0/online_masters_in_business_analytics_texas.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/w/file/fetch/145067553/english_file_elementary_third_edition_tests.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ec8d6f-fd83-4ba1-8bb3-b1ac376a9563/xegowotodimuzixoxuzuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a68414-9d88-4f7d-8055-21745a53d488/sotulaxidejajawezodasumuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece58e3e-3dbc-4036-b1aa-ee528e59603d/historias_biblicas_para_nios_pequeos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81857a8a-d90d-4bb2-a77b-1bdff5bf6524/lexubuge.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_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 5304 bytes
SHA-256: c9baee6af763232f6701ea5c96d1ae34cc17ad4b0a8b334fb7f4255f0afb7f9c
font_01_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 10712 bytes
SHA-256: d6b4e0050ba0a9079f8145f23cb98d71096969aea059036be952d2d9f0e1a3e0