Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef8c5d484e99f10…

MALICIOUS

PDF

80.5 KB Created: 2021-06-14 22:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6e33a325705427a66ec6f560b137a686 SHA-1: abde6ca6a46057d535e03214c3ed39023c24f39a SHA-256: 1ef8c5d484e99f10e486d37d3cfd73df3292ada8b5b1517651933af3e16a4d91
186 Risk Score

Malware Insights

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

The file is identified 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, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF structure strongly suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://allytemp.ru/pbw?utm_term=the+girl+with+all+the+gifts+sub+indo PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460466/normal_5ff2022f60d94.pdfIn PDF document text
    • https://vegalatunom.weebly.com/uploads/1/3/0/7/130776393/pisukagojekob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409606/normal_5fd13649e9f80.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450152/normal_60b0ec2b61f6e.pdfIn PDF document text
    • https://tujowijide.weebly.com/uploads/1/3/0/9/130969571/dd6345a86.pdfIn PDF document text
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/eb00e6774e23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_602690210c5a1.pdfIn PDF document text
    • https://jogosoti.weebly.com/uploads/1/3/1/4/131453036/dabuzazir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_605d69d96c0bd.pdfIn PDF document text
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/704db8.pdfIn PDF document text
    • https://dixitelenamipum.weebly.com/uploads/1/3/4/3/134380202/1419746.pdfIn PDF document text
    • https://nixalimug.weebly.com/uploads/1/3/2/6/132680811/9f2023c.pdfIn PDF document text
    • https://befojawukirafa.weebly.com/uploads/1/3/4/8/134855882/xoweweme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451205/normal_601cb851411fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479715/normal_603098a796ae2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nijominem.pbworks.com/f/surface_area_and_volume_of_a_cube_worksheet.pdfIn PDF document text
    • http://povivokovawi.pbworks.com/f/violent_storm_mame_rom.pdfIn PDF document text
    • http://wekibivu.pbworks.com/w/file/fetch/144628941/why_is_kitchen_cleanliness_important.pdfIn PDF document text
    • http://runuwitol.pbworks.com/f/45018662532.pdfIn PDF document text
    • http://xobapotowi.pbworks.com/f/resumen_del_seor_de_las_moscas_capitulo_2.pdfIn PDF document text
    • http://serukula.pbworks.com/w/file/fetch/144680427/printable_calendar_march_2021_imom.pdfIn PDF document text
    • http://guronavageba.pbworks.com/w/file/fetch/145224936/the_diary_of_anne_frank_full_movie_2009.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_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 5352 bytes
SHA-256: 50c364c42343d41fe3709cc1161f457f0ee8dd75f977d57cadd77c9f83169c74
font_01_sfnt_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 12672 bytes
SHA-256: d89319bbbbc3dffb4637318437af0d726def9398d8106b47b699c46c0f7530a9