Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f7ed6c6305f3c7…

MALICIOUS

PDF

75.0 KB Created: 2021-06-11 01:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 952bfe74f34562120ecfd5fee116b5bf SHA-1: e23049cbbf213d249193e3758d196c78951b4f00 SHA-256: f4f7ed6c6305f3c72f657445fd620cf416b590b1a0d091190c6d9ed13ed3e2e1
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 pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nomylo.ru/pbw?utm_term=aspects+in+astrology+sue+tompkins+pdf PDF link annotation
    • https://murezujal.weebly.com/uploads/1/3/5/3/135305344/8455c7222b1016.pdfIn PDF document text
    • https://buputulu.weebly.com/uploads/1/3/0/7/130738697/5764240.pdfIn PDF document text
    • https://pefobasor.weebly.com/uploads/1/3/4/1/134131397/perajad-xikuvazora-jafoxeso-diviliponi.pdfIn PDF document text
    • https://lokudepapina.weebly.com/uploads/1/3/5/3/135325929/8357014.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sejiliki.pbworks.com/w/file/fetch/144698175/48182281892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8855e0e5-4f79-4b18-b8a3-2598a227de44/guitar_theory_straight_talking_music_theory_for_guitarists.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ec81cf-a75a-4aa8-a505-1050ac63c76a/how_to_teach_latin_and_greek_roots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66ef0b3d-699d-43ea-86d3-f25b47a28eb3/nujimewuxekibot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d61d0263-acd5-440b-925b-7a058874f311/75235376991.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/f/dd_companion_character_sheet.pdfIn PDF document text
    • http://depowota.pbworks.com/f/nesunolanomirapigurovabov.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/w/file/fetch/144465618/zagebujosixisizufuwiruzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e682d5f5-0a89-49c0-b1e8-065f6416651f/how_long_do_you_cook_frozen_chicken_breasts_in_crock_pot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca63d8f-1a83-4535-980e-2b246351a1d0/xowifok.pdfIn PDF document text
    • http://papoxuva.pbworks.com/f/how_to_fix_a_porter_cable_nail_gun.pdfIn PDF document text
    • http://mepijewaj.pbworks.com/w/file/fetch/144626796/redixegukatigiliperuliz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad09bb3-b27b-4a5c-89e0-2531ca3c47eb/43329789247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e2194d-4cea-452b-ad40-510fd18d7f7a/45839685427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f29dda-dac3-444d-a9ed-19e01e10ccc0/12472395597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d4b303-6cba-4976-826a-e7526787516b/what_skills_does_dbt_teach.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/f/lozelav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d52fd6a0-3cbd-4da3-9c9b-0ea45f64b61a/gujifegejakopetubalerobe.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_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 5632 bytes
SHA-256: 764ac206fe1aafbd692b7b85ef24087ab487431e0f7ed89ab61b7e21e6f8f61e
font_01_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 11340 bytes
SHA-256: ec879ed73f604b47a7c06d8ba08d1d9b3224fcbe43e9bb2b8b0883e78074dc9a