Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc0709ef1b6b696…

MALICIOUS

PDF

81.1 KB Created: 2021-05-28 21:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a6b901b49620f9ce952d6b32043d2a1d SHA-1: 27f651eab016b2a27ffb4c38b94fe41236310aa9 SHA-256: 0cc0709ef1b6b6967e5f20e6369c2d34df34fd206100aaa16fc7152e07a60f4e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

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://xajibur.ru/strik?utm_term=need+for+speed+mod+apk+hack+download PDF link annotation
    • https://jikudirag.weebly.com/uploads/1/3/4/0/134040407/7eb1e.pdfIn PDF document text
    • https://jozegolufipiz.weebly.com/uploads/1/3/0/7/130776065/debiwika-kaxeragawalol-situpopuvit-wonaz.pdfIn PDF document text
    • https://semulojera.weebly.com/uploads/1/3/2/6/132695334/getozuligebes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_601b5cbd00968.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454052/normal_60068cbb21978.pdfIn PDF document text
    • https://rutisipileriruk.weebly.com/uploads/1/3/2/7/132740940/6977890.pdfIn PDF document text
    • https://muledejudo.weebly.com/uploads/1/3/4/8/134888896/f32c36ad1dde.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/1190129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378383/normal_5fd330f5162a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426557/normal_6001cfd2e6254.pdfIn PDF document text
    • https://megefutuw.weebly.com/uploads/1/3/0/9/130969536/9727453.pdfIn PDF document text
    • https://nakilogizo.weebly.com/uploads/1/3/4/3/134363069/wafok-mowem.pdfIn PDF document text
    • https://mapadubedebo.weebly.com/uploads/1/3/6/0/136095435/tuwijanulelijij-sebarulu-sogatedopa-woxuwumupawoxa.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/d4ee8c22-9b9d-4ee4-97db-03b45587e05f/padi_open_water_exam_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df4eb2bd-71bf-4461-a323-3fc6d24b72d0/ejercicios_de_comprension_lectora_para_cuarto_grado_de_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7808cd-04c8-475d-8cdd-e9ad3e26f082/who_are_the_main_characters_in_the_notebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a3b9191-a2de-4284-a44d-88efcfbd7490/cs8592_object_oriented_analysis_and_design_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fd4bda5-ecfc-410b-8f15-fbbd21ad9e8d/how_do_i_change_my_icloud_password_if_i_forgot_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef043e19-c656-4dbf-9c8e-de1929a3e7a3/how_to_claim_back_rent_arrears.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 2960 bytes
SHA-256: 3a99bfcc8a6322cb1f5d9dd0c76c95525b0630114fc12c53a342d41e6b6e0e01
font_01_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 5520 bytes
SHA-256: 9ab22b3c8eeaefb119d94416c112ce6b1b40f03230537ba334b6b4d7a1e29b20
font_02_sfnt_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 11500 bytes
SHA-256: ed9439611ad5a95198b364efd9d601703f7a67b9f3b926f692b217821214a97c