Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cf7749f6c09752…

MALICIOUS

PDF

76.2 KB Created: 2021-03-18 03:30:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b8fb98242bd8676d72c34387112f3cef SHA-1: 9fb693e3b46b7f4175e7e5dfe21661d2ba90413c SHA-256: 44cf7749f6c09752008e911dd7460c4e750a109984471f856f0592c19cf95a0e
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The primary URL, 'https://nipisod.ru/award?keyword=introduction+to+the+catholic+bible+pdf', is presented as a lure to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/award?keyword=introduction+to+the+catholic+bible+pdf PDF link annotation
    • https://cdn.sqhk.co/nepajenine/hM0Xhie/rivedatod.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/ge5eBif/world_history_books_for_kids.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/hjcicgF/55769490971.pdfIn PDF document text
    • https://cdn.sqhk.co/xivomojuf/bYmihKZ/3d_tennis_court.pdfIn PDF document text
    • http://itwow.info/fiwuwepudirunuvadibivofukbzx5.pdfIn PDF document text
    • https://mufiguxibetifo.weebly.com/uploads/1/3/1/6/131607440/8081096.pdfIn PDF document text
    • https://silixumofabu.weebly.com/uploads/1/3/2/7/132712413/ligevebuni.pdfIn PDF document text
    • http://ductsunlimitedins.com/zorosozad1svzy.pdfIn PDF document text
    • http://dalkomis.website/what_is_the_main_theme_of_the_book_of_genesis6ax7j.pdfIn PDF document text
    • http://leaninrzpd.site/sas_survival_handbook_third_edition_the_ultimate_guide_to_surviving_anywhereemh8g.pdfIn PDF document text
    • https://pidakulosa.weebly.com/uploads/1/3/4/3/134391257/lilatolubujivo.pdfIn PDF document text
    • http://wimosam.22web.org/ceneval_telefono_informacion.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_4b511a4ef8c34c2faeed0b1a58612343.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c742de5f-6ba5-4104-a075-46f066eb5f71/somiritumidapedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/513bda77-b05a-4185-aff7-9a001a714cf9/zone_of_proximal_development_higher_level.pdfIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_2bfe9d5552364e1885508c3fbc1a75be.pdf?index=trueIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_96a961f443b6471a8654c1c31fd3f3eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44010717-9855-4a06-aeda-57bebd2e404f/sanomij.pdfIn PDF document text
    • http://sozitemow.epizy.com/b_pharmacy_syllabus.pdfIn PDF document text
    • http://xawiponifazu.epizy.com/65146835396.pdfIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_272350f24d18445c81d1d05716dfb533.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b16efa6e-3826-45f3-bc9e-f875355c5d95/dramacool_house_of_spirits_tvb.pdfIn PDF document text
    • http://nawatelobuj.rf.gd/nojarononitodoxuniramutu.pdfIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_2247c383d7b34f05a5b4390b758ab91b.pdf?index=trueIn 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_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 5140 bytes
SHA-256: c01f0232943a833a29c126e44d9fd0570dd51ca858ca5e7047173d40f94d0f4a
font_01_sfnt_off0000fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 10796 bytes
SHA-256: 1a26bc59a7f208139bedb074fe9c0e0ecf131cbe709908b2dc845c4293e40440