Malicious PDF — malware analysis report

Static analysis result for SHA-256 270ec0aa1d1efd21…

MALICIOUS

PDF

93.7 KB Created: 2021-05-28 07:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3d32a3a7f811513525a62ac345204087 SHA-1: df5157d046dc2755da584b941575061639bf2286 SHA-256: 270ec0aa1d1efd2152a0d419329467064e66e87161c74d037132cf8d9f3af5cd
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 0.9973

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://jottigo.ru/123?utm_term=bangla+english+arabic+dictionary+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5fd1708a56d75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420767/normal_60416108af722.pdfIn PDF document text
    • https://fewarixavaj.weebly.com/uploads/1/3/4/8/134847043/8401847.pdfIn PDF document text
    • https://vowabogebem.weebly.com/uploads/1/3/0/7/130775978/fikisetaluxiza.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/6622200.pdfIn PDF document text
    • https://roluwisotem.weebly.com/uploads/1/3/4/3/134368144/xijuvawenijakaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484376/normal_5ff41398364b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490917/normal_5fde978e7f155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_6051a149937b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446490/normal_605520b23830d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408481/normal_60314da749d21.pdfIn PDF document text
    • https://wixetaduzem.weebly.com/uploads/1/3/4/4/134471786/difumivuzowa_kozibi_zujeduno_vatunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501027/normal_603c46939f6f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_6047d3e4883da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_5fd6fcf300cb2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8f492148-a2f2-4c9a-9867-fa44e118c8e9/what_is_alla_prima_portraits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/906c7869-d131-4367-b3b1-3d16ea41a2ca/giradewitox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c999ccfc-4ca8-404e-a9c5-a1d7ef19a02d/aci_318-14_free_download_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c484e0-f4e2-4181-8486-75f203fe5530/44955750321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceab420c-2c86-4295-b7fb-88de6cca9d62/how_much_is_coursera_data_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fefaf88-e9dc-4229-bdae-4e2800646f71/26721915323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f55bbf9-4ad4-4fd4-b7ca-329f0730fe6a/samsung_bd-h6500_region_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b379fcd7-3c87-4b93-92ce-9a7dffe863a8/xezawagor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26add088-71c0-41ce-85d1-162eafad64ce/xolegovagixagomemo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000139b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x139B7 19856 bytes
SHA-256: c2c0613b0e5b6a824db80d1423cc449f537634962d3bab3d3afa7944880ce16c
font_00_sfnt_off0000e967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 5496 bytes
SHA-256: 980096df3fce901eaf2aa5c4482951c7b19d0c0c84139f0b0c7f0bb86b0ffec8
font_01_sfnt_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 7764 bytes
SHA-256: bcf29d8ff39cac8b3a1363de5d4a267aabc73cd15dccca22f2e2ac1e0325831e
font_02_sfnt_off00011443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11443 10956 bytes
SHA-256: 5279b6b87ffdd925dacf59cdfb7afaa501a19d1dc6958699cee1e8db595c4ab8
font_04_sfnt_off00015a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A19 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2