Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c2dae4d0aa7598…

MALICIOUS

PDF

77.1 KB Created: 2021-04-15 11:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3cfc5cd3b3e8ae7c05573e32687d9f76 SHA-1: 21e6e057ecd08730df50e5504fbfa228473389cf SHA-256: 03c2dae4d0aa75982d2a815f4086f7755ff3a8bc5322842ecc5f8360562d23fe
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though partially obfuscated, contains text related to search queries, and the embedded URI points to a URL that appears to be part of a phishing or scam campaign. The presence of multiple external URIs, some hosted on disposable domains, further supports a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=how+is+dbt+different+from+cbt PDF link annotation
    • http://lnstagramverificationbadge.com/96799284693vqtxc.pdfIn PDF document text
    • http://kirivil.iblogger.org/career_management_definition.pdfIn PDF document text
    • http://gafaneripebenu.iblogger.org/bojamigawibamof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457572/normal_6061782e8ec1b.pdfIn PDF document text
    • http://sunny-web.ru/jumubiregamanosofogu8p24a.pdfIn PDF document text
    • http://retesopi.iblogger.org/so_sad_status.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366348/normal_605f7897c1944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_60611f58ca18b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527108/normal_5fcdce41cb14d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486997/normal_603537b95afbf.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/afa7a5ce-922b-44ab-887b-01c24b902245/6063256716.pdfIn PDF document text
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_f21fdfee886f4ddea87e9e63bcfca7aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bd935ba-c7c3-48b6-818e-630257b6b197/19472801204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ea7d5e0-df32-49af-a4e8-2867fbdee903/weider_crossbow_for_sale.pdfIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_36114cb10dc0470eaa26755fa24ab3a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedowedi/english_picture_composition_worksheets_for_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/backbench_student_telugu_full_movie.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_bf029dde223d4d52b05bd38312f18551.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_9b7da41074cb4a6d9936b1184970634d.pdf?index=trueIn PDF document text
    • https://f6142301-0c02-44dd-b2c5-62cf9b3cd0dc.filesusr.com/ugd/ebfdba_07028ef9a58b4f51b8d2a3131c6731c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupebesu/damovititajesujanut.pdfIn PDF document text
    • http://rifimazagajide.epizy.com/what_size_washer_do_i_need_for_king_size_comforter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bcbea2f-1fdd-41dc-9d6c-631825d245d1/kobalt_hvlp_spray_gun_manual.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_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 5120 bytes
SHA-256: 7a4f9687126176a5e02d8e4819ffcb2dacc85d47c26562c826fef642bbf576a6
font_01_sfnt_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 10416 bytes
SHA-256: 56657415de95d9c042e8edab972d530d9d3aa51e956c426d4bc36b700f675c11