Malicious PDF — malware analysis report

Static analysis result for SHA-256 96255213d897a777…

MALICIOUS

PDF

76.2 KB Created: 2021-03-06 06:30:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a47d7de850007eb2220509b6782f6b79 SHA-1: 4cef06360f37ffde68812545f3edb58d8548bfab SHA-256: 96255213d897a7777afdd57bdef1070a1838c5e4f52326a5f4501f1c5eb906c6
186 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/award?keyword=bose+321+series+iii PDF link annotation
    • http://kexolifowuj.medianewsonline.com/tabla_periodica_elementos_metalicos_no_metalicos_y_metaloides.pdfIn PDF document text
    • https://lanoxujuzon.weebly.com/uploads/1/3/4/6/134630121/8774827.pdfIn PDF document text
    • https://wusoxebuwewete.weebly.com/uploads/1/3/4/4/134432123/2934656.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/9374098.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/altered_carbon_season_1_episode_10_reddit.pdfIn PDF document text
    • https://liguroxuf.weebly.com/uploads/1/3/4/4/134443360/1771090.pdfIn PDF document text
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/5601194.pdfIn PDF document text
    • https://zovipimisog.weebly.com/uploads/1/3/1/1/131163747/9959349.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/defojen.pdfIn PDF document text
    • https://julixejim.weebly.com/uploads/1/3/5/3/135393951/514761.pdfIn PDF document text
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/ab5ef30666.pdfIn PDF document text
    • https://xesisawizes.weebly.com/uploads/1/3/1/6/131606125/wipej.pdfIn PDF document text
    • https://pufujodixig.weebly.com/uploads/1/3/1/4/131438007/zefajizotar.pdfIn PDF document text
    • http://fuwijumazawad.mywebcommunity.org/how_to_make_a_voided_cheque.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/best_app_for_interior_design_3d.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/7adbe359-ef8f-48c8-a21c-1ae39dd9ebfa/71198341777.pdfIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_7ab325130f654a648463d9a23716ba91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cffbe22-d936-4413-9cda-ee5256c986fa/loloporudujajinogabura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e4d27c4-eddf-42b0-9925-f32f23740b7a/western_digital_my_passport_wireless_pro_4tb_wifi.pdfIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_d208dfa3a53d42fd98a179e10fb4aad9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13a3941d-7e00-406c-b328-2dec496f96e5/80377593293.pdfIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_b274b936fb2f4f3d925e6c0bf1bfcc86.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b783273b-972b-48fa-bddc-a3fc757e2f4b/call_me_by_your_name_book_review_2007.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_6c780f4876844b8f83a996507a56c8db.pdf?index=trueIn 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_off0000ee75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE75 4832 bytes
SHA-256: 294497e959680fbe3ad436a6ab7e8a65fea691f116b8169fbb3b03856684bb8c
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 10332 bytes
SHA-256: 7d6673477616f0254f03930483268820b27d16ca57ab167f31be8823a1ec2d2d

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