Malicious PDF — malware analysis report

Static analysis result for SHA-256 0926f61639d990e3…

MALICIOUS

PDF

79.4 KB Created: 2021-06-02 01:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 74d304a14b18beb71f36bda585ea7878 SHA-1: abbe51201f02d5315d5ee4b9921573dde4636cdc SHA-256: 0926f61639d990e32b545292bafb89dc4503df9418a9224c1bf4c5cadfa619b8
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attack.

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://xezojetit.ru/123?utm_term=adobe+colour+cc PDF link annotation
    • https://dazifefizax.weebly.com/uploads/1/3/4/8/134854215/8081502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475859/normal_6040c42646aaa.pdfIn PDF document text
    • https://vodoxuzet.weebly.com/uploads/1/3/2/6/132681632/xedazipeba-kekago-befodani.pdfIn PDF document text
    • https://tozubovudifudi.weebly.com/uploads/1/3/5/9/135973827/deles.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489033/normal_5fc99f786911c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420449/normal_603d52cb1950c.pdfIn PDF document text
    • https://geruzusuvar.weebly.com/uploads/1/3/0/7/130776720/zodalitofidajezaxup.pdfIn PDF document text
    • https://puwikopigab.weebly.com/uploads/1/3/1/1/131163601/3716369.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/rarifimef.pdfIn PDF document text
    • https://sinegozedajosor.weebly.com/uploads/1/3/1/8/131871849/4265506.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b035473-440e-4e52-be9f-a961ca3cb150/organisational_behaviour_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ecd270-2c2e-4feb-8131-f59d4858dc2e/go_math_practice_book_grade_8_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51fda9ec-71d0-497b-b4f9-eb76ad015417/bumibinifimubidum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d4befc3-a979-4250-8416-a28e3bc8bb84/opticover_ac1200_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc8c1aa1-97d0-4fd8-ae8b-7aaf09297297/read_physics_books_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c1981f4-cf45-471a-b922-bf9ba144b086/80105737338.pdfIn PDF document text
    • http://mukibilevejo.pbworks.com/f/how_to_noclip_in_geometry_dash_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e00de0c-01d4-4213-a25e-511a22b2f9c3/wahl_clipper_guards_target.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/756336b3-5cad-4122-8022-f7a5840996d3/67086374742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c0a0e7-acdd-48a9-a321-489faee15527/pupugexasasofiligenub.pdfIn PDF document text
    • http://kunixove.pbworks.com/f/probability_distribution_problems_and_solutions.pdfIn PDF document text
    • http://wisarazed.pbworks.com/w/file/fetch/144466539/can_you_retrieve_deleted_whatsapp_messages_from_icloud.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/f/pixotoser.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_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 4672 bytes
SHA-256: cc728369de779dd1deab7e03afc62a28a5807475c22246cbd24ab8577f62def9
font_01_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 22032 bytes
SHA-256: b912dca45dc122a7b00a19bf26563398f361722664c5639da5445a56419b7bfa