Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8b14f4a10c5c53…

MALICIOUS

PDF

80.5 KB Created: 2021-04-27 04:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b609a9834ac507ac7899624c6b9862e4 SHA-1: 12f5d593d764e1513ce3aa253160ea64d8ee4a38 SHA-256: 3b8b14f4a10c5c53b373454f3af1edc9d30c0d70f06519f513ec580a2b2c0968
166 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. It uses a password-protected-archive lure. 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 0.9998

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dafemum.ru/strik?utm_term=johnson+privilege+power+and+difference+3rd+edition+pdf PDF link annotation
    • https://mejebepagomuda.weebly.com/uploads/1/3/4/4/134494428/55275.pdfIn PDF document text
    • http://cardioactiveitalia.site/5092162088dbslc.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/tomepuvinugeza.pdfIn PDF document text
    • https://cdn.sqhk.co/lonuxogugexi/grPgegj/cat_verbal_ability_practice_questions.pdfIn PDF document text
    • http://prosale.company/nesazepumokizifobajubgbrtz.pdfIn PDF document text
    • https://cdn.sqhk.co/zaperarori/gg2lKfB/banotekilawupukupodoti.pdfIn PDF document text
    • http://baxijemapuzoxu.22web.org/lunop.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://istlan.fun/cyberlink_powerdirector_14_tutorialbnir6.pdfIn PDF document text
    • https://vunidiripoga.weebly.com/uploads/1/3/1/4/131453449/migodut.pdfIn PDF document text
    • https://zipemulobob.weebly.com/uploads/1/3/4/5/134528333/jafixifip-xixafole-zadivo-nigevakirezivo.pdfIn PDF document text
    • https://varovugunigode.weebly.com/uploads/1/3/4/4/134480676/3110117.pdfIn PDF document text
    • http://neip-forum.fun/91891990540goyil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavisawadafo.epizy.com/happy_holidays_card_template_free.pdfIn PDF document text
    • http://xadamun.epizy.com/23241965626.pdfIn PDF document text
    • http://minudiginodege.epizy.com/sexov.pdfIn PDF document text
    • http://febaxur.epizy.com/contending_theories_of_international_relations_a_comprehensive_survey_free.pdfIn PDF document text
    • http://vepilezora.epizy.com/bagger_dave_s_nutrition_information.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_off0000fb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB11 5720 bytes
SHA-256: 3ca0e474c823bc8cf8111338245119a9f2c1bb8655a73fa80ee7439ee2784149
font_01_sfnt_off00010e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E99 11344 bytes
SHA-256: 89c6db5d558f527f15beb3b16a4c06427def71438439a54cb7c0cb9ca663b8b6

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