Malicious PDF — malware analysis report

Static analysis result for SHA-256 84cf33c4421cf99f…

MALICIOUS

PDF

72.9 KB Created: 2021-06-01 17:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d3f7866bb67f0baa95b20417024b1b3a SHA-1: c0d11b807c5517ec8900fb8e5def0374aedc275f SHA-256: 84cf33c4421cf99fd2c7372b4ccc9b6ecffefd9939f3fe3cac9e4c286a4ba0e2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/123?utm_term=brother+songs+in+tamil+lyrics PDF link annotation
    • https://zapilututok.weebly.com/uploads/1/3/4/3/134341349/wajawezuxizizub.pdfIn PDF document text
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/ravosabezavin.pdfIn PDF document text
    • https://jotabejomunumog.weebly.com/uploads/1/3/0/8/130813846/jazerovadap.pdfIn PDF document text
    • https://fupelesanu.weebly.com/uploads/1/3/1/6/131606305/vukomuv_lusurefulumarex.pdfIn PDF document text
    • https://ximumarititudor.weebly.com/uploads/1/3/7/5/137516614/vimoliwizalotivo.pdfIn PDF document text
    • https://jotajawe.weebly.com/uploads/1/3/1/6/131606146/kitenugupeli.pdfIn PDF document text
    • https://gokewulifas.weebly.com/uploads/1/3/4/5/134599519/6c38922609.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/dda3a69b-77de-4325-8a64-33c1495c8deb/49105113044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/304a3ac6-e217-4535-9657-b5114b63876e/how_to_make_cadmium_yellow_medium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab9aafa-5a08-4a42-8c18-d215de557129/fuvupiterijemegosewiruwew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e490e456-d674-46ce-bf21-c23d20a1ef0c/nora_roberts_stanislaski_series_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8968800e-2e9c-4ce1-bc75-98178bda2da6/menciona_4_tipos_de_comunicacin_escrita.pdfIn PDF document text
    • http://faxamom.pbworks.com/f/61332438656.pdfIn PDF document text
    • http://masawumel.pbworks.com/w/file/fetch/144420318/33046758002.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/teoria_del_aprendizaje_por_descubrimiento_jerome_bruner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46b2c26c-1f48-4e9c-b6be-e1cbff96e208/interior_design_magazine_subscription_ireland.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/547d7bb3-9c1b-43c2-932c-66d16483522c/jasogirowomesomanam.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/f/is_tracfone_iphone_unlocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2b0cea-806e-415c-a326-1e9eeff660d2/stand_off_meaning_in_hindi.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144428409/xasurinusimasamazubaj.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_off0000e01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 5364 bytes
SHA-256: 5519236ad3b9ddd0164c55b226c6c29d6b21a32399c22aca01a6aeb6d18d1d4a
font_01_sfnt_off0000f239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 10828 bytes
SHA-256: 823258020d53151f5e4152a50d0fbd5633b59e87e28162b40ad6087511389782