Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb6c0ecc619650a…

MALICIOUS

PDF

117.5 KB Created: 2021-03-20 06:23:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 811ba410af7bdaa86577d209ab1ab22a SHA-1: 52ebbbd8f73280dd769ca9c907280a08188d439a SHA-256: ceb6c0ecc619650ad01c3ee695b726f28f934f001eac9d1293dc1bbc6d9fd7b0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=vsx+824+manual PDF link annotation
    • http://bozesedixek.mywebcommunity.org/biblia_nvi_descargar.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/how_to_understand_summary.pdfIn PDF document text
    • http://texoraw.sportsontheweb.net/asal_muasal_pelukan_candra_malik.pdfIn PDF document text
    • http://xatovapotogu.mywebcommunity.org/discuss_the_capital_structure_theory.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/Ajjhib7/dovalizedajudazefavol.pdfIn PDF document text
    • http://tikopariwoxa.mygamesonline.org/34829379372.pdfIn PDF document text
    • http://nulivanofika.mygamesonline.org/liberalismo_resumo.pdfIn PDF document text
    • http://pivojowemetobiv.mywebcommunity.org/makujisewulimuz.pdfIn PDF document text
    • http://babusokojanog.sportsontheweb.net/1376476799.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/wedding_anniversary_wishes_for_my_pastor.pdfIn PDF document text
    • https://cdn.sqhk.co/nufomewo/5OgigcM/burger_25_locations.pdfIn PDF document text
    • https://cdn.sqhk.co/nilofixogezu/EjihcqN/elton_john_songs_from_the_west_coast.pdfIn PDF document text
    • https://cdn.sqhk.co/rezeribevi/iFwWrja/world_conqueror_4_modern_war_1.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_8296b3b0aca84b20b3ad95583a92ebb9.pdf?index=trueIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_b84a749df5884295bb142e3f229a8d7a.pdf?index=trueIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_8fcad5cd249a4fbeb8767b5c17a5f1c2.pdf?index=trueIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_b5ee783865bd4faa877616892fc5131f.pdf?index=trueIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_0168320397b147f5b7cf9874ca1e4089.pdf?index=trueIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_4cf3b271b6af4c61be27d3a92c234e45.pdf?index=trueIn PDF document text
    • http://zezofakarol.myartsonline.com/chemical_properties_of_oxygen.pdfIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_94bffa018bc144e29d062bc7fdbf826c.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
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17335 2484 bytes
SHA-256: a1db38228f5eb28461067c32986fc7beb38823cd04ecd2f0e0759e4964ba6b86
font_01_sfnt_off00017e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E27 5184 bytes
SHA-256: ccbc688246b770dfe50931c0348ee42939e2daf628c274474260a810ebeecf75
font_02_sfnt_off00018fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FCE 8976 bytes
SHA-256: 5f07b96a345167f8d597a4b3e1fe0e52dd7a62508af6f8e7b00de7561a89dfc4
font_03_sfnt_off0001a191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A191 11400 bytes
SHA-256: e5379ede4bce483ccb31770e0a22ac4f4708653cb7d331f84495d2a761798e96