Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6bd11fdbbd644c…

MALICIOUS

PDF

71.4 KB Created: 2021-05-06 14:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cb5cf5c33fcb374fe5ff7fbe5660f3e3 SHA-1: 5e4b3335f71ea60a54999894b7f85bcf1166eace SHA-256: fd6bd11fdbbd644cdfd8afe969301b1f18589dcf09623835621534f0f56fe8a3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=greek+and+latin+roots+creative+teaching+press+pdf PDF link annotation
    • http://sneakerspapa.store/what_is_the_media_dependency_theoryins28.pdfIn PDF document text
    • http://24goodstore.site/nice_guidelines_pulmonary_embolism_managementvj3th.pdfIn PDF document text
    • http://prognoz-football.club/4994025923036tss.pdfIn PDF document text
    • http://mon-compte-cmb.best/enthalpy_change_of_solution_definition_ocrrp2bf.pdfIn PDF document text
    • http://lojasamericanasbr.com/londa_badnam_hua_mp31nakj.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/36f33ee4-e595-4817-bdb7-e6b991cf9157/sv98ln_wont_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d55147b-cf76-4a50-a67e-6e45a54e8c5f/stone_of_tears_review.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/bioresource_technology_reports_impact.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8f2767-171d-42fc-861d-8944cec8c84f/96051488837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ebc0fc-43cd-4bb5-8068-785b04f9e3ad/ligakaputom.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/break_into_the_dark_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/jobukem.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_5fefe8654c8c45dc9fc0d3a98182dbce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/student_information_system_project_in_vb.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/tamil_dubbed_hollywood_movies_link.pdfIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_de407b4f6e9e4944af133b4b22b73e62.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfa8af8f-d416-4a18-8d79-dbdbb7aab67a/nfl_code_of_conduct_class.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04578756-970d-4636-8bc9-40ec84899ba9/nikigegepobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03474609-d2a5-4b10-a6e6-7142607b556a/graphing_trig_functions_worksheet_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/sasedijegivudawasofavobeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/713c2d38-25dd-4970-a85d-b18e5f84a5de/tepugasuparogiserefu.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_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 5572 bytes
SHA-256: aed6b0184482e86be340a30bd50d71735607629e5b85c31c665e88e6e52b8c7d
font_01_sfnt_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 10456 bytes
SHA-256: 2a9be4e02d901ddd5ef20198c0aaa5fb765225e7a44ff4c32820a4d915d20cdf