Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf15830adac3cafb…

MALICIOUS

PDF

76.4 KB Created: 2021-06-10 14:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4c036a9f5b5fd493ace0d6413f403b98 SHA-1: 8163918908fcb78dbd37546f3236dce9e7781bf4 SHA-256: cf15830adac3cafbef15255433b9d8eae171f76372c6225ff92489b462036f06
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 0.9997

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://pixomot.ru/pbw?utm_term=army+mft+exam+2+answers PDF link annotation
    • https://sofubile.weebly.com/uploads/1/3/4/3/134380394/fcdf670e062455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469617/normal_601d77d269a9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456116/normal_605bf3a0550ed.pdfIn PDF document text
    • https://paduzegisenulun.weebly.com/uploads/1/3/4/6/134665595/tasefesomize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_600b3cd04f29f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_604046d12a981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469119/normal_603355db03a45.pdfIn PDF document text
    • https://vupudirul.weebly.com/uploads/1/3/0/8/130874586/kofinodiwel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144411867/tagowovomitetizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac456b35-995a-491b-841d-f97d9475ac99/management_science_the_art_of_modeling_with_spreadsheets_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ead1c3-46db-4e97-a03a-bd5e4db8cae1/what_is_the_principle_of_magnetic_particle_testing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f512c101-f36a-4008-a450-e6e49b7c006e/visokujoguresixikexuze.pdfIn PDF document text
    • http://zotugon.pbworks.com/f/57199935910.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144423747/roropafifawokubawowoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b226c1cb-ea97-4e2a-8d20-12afaa950a77/is_paulas_choice_reliable.pdfIn PDF document text
    • http://piwomimagito.pbworks.com/w/file/fetch/144841197/plotting_points_pictures_worksheets_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcb71cbd-3e04-413c-a152-14ad420858b8/the_seafood_shack_houma_louisiana.pdfIn PDF document text
    • http://lokiboz.pbworks.com/f/fexapevorizikinewafarit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3fa524d-f4df-4991-b8a8-da2510cd9cce/dapaniwuju.pdfIn PDF document text
    • http://gemometis.pbworks.com/f/what_are_the_six_annexes_of_marpol_73_78.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c357d32d-685e-4a00-b564-daf92420a603/carl_rogers_contribution_to_psychology.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_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 5264 bytes
SHA-256: ff0ac312017c2db46d42d64a4ba5eb2ae4a79b65e3b7db4d9340aa6ca2253569
font_01_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 11188 bytes
SHA-256: 367782b931f9de161d09938c9205a402537a1e06eb73f4796ec40b89ae4a1ae1