Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba22101ce804e83…

MALICIOUS

PDF

78.1 KB Created: 2021-04-11 02:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b56ea24531c3efe8fbcdfa4f41973468 SHA-1: e1025b0714fcba69677b48cff181f21d0a128d4b SHA-256: cba22101ce804e832585744f438c91d0dd15679075b42fba81f6ae20ea699160
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, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to potentially harmful content or phishing sites. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to lead users off-site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=bob+marley+and+the+wailers+them+belly+full+live PDF link annotation
    • http://sojuvofud.22web.org/74824100324.pdfIn PDF document text
    • http://fc-aromat.ru/checkpoint_interview_questions_glassdoor7x566.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379611/normal_5ff48a23e0784.pdfIn PDF document text
    • http://noksipals.online/jonejilm0c7y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383688/normal_605c34f937cbf.pdfIn PDF document text
    • http://blockhcain.host/26300846302au7c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nokefibazapowem.rf.gd/fulamatosukonakekopewab.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/lg_hbs_800_pairing_to_computer.pdfIn PDF document text
    • https://a7176590-a44a-43b4-8b25-1171fb6190ac.filesusr.com/ugd/e6ccb8_cb4b08282c3b404a8d8336696a94dce1.pdf?index=trueIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_931fd6763b5043e29aa3875cfb18895f.pdf?index=trueIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_d751eebcad084020822277f5ba5b5c4a.pdf?index=trueIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_e63d0f4a72794f079b7bddca09b17798.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pisik/aladdin_full_movie_amitabh_bachchan_720p.pdfIn PDF document text
    • http://lejarojat.rf.gd/fundamentals_of_heat_and_mass_transfer_7th_ed_incropera_solution_manual.pdfIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_f5ae89a4c2774675a8cb8a385bd9acf2.pdf?index=trueIn PDF document text
    • http://nomapalugaji.epizy.com/alfabeto_grego.pdfIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_f298de7f901d4319abc4e08c00670c12.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/figoveparokajijomum.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/fredric_jameson_postmodernism_or_the_cultural_logic_of_late_capitalism_new_left_review.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_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 5592 bytes
SHA-256: 07ee0a6bec37de50a82543eff0d5cd5eb9f6dea28ab6c51dd319b845fcf503ea
font_01_sfnt_off0001050f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 11444 bytes
SHA-256: 41e65030c043588ebbc0d9830845be01f1bd9c277de5a93502a1e456f387e403