Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a72131a5cfc9c3…

MALICIOUS

PDF

87.9 KB Created: 2021-03-13 18:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 423972d82dd77157a50bd15be23c5457 SHA-1: 03b73be21049562d6e69a6c87f165802bd5e1204 SHA-256: c3a72131a5cfc9c3c5a61d29cef0ca8cfe75147dbc43ab1928dfdbab21f7b330
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file functions as a link farm, containing numerous external links to other PDF documents hosted on various domains, some of which are disposable. The presence of a 'Password-protected archive handoff' heuristic suggests a common tactic to bypass security scanning by requiring a password for an archive or attachment. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://dugedepap.ru/123?utm_term=call+blocker+apk+full+version PDF link annotation
    • http://carinsusa.com/portfolio_bootstrap_page_templateracvn.pdfIn PDF document text
    • http://ketoxitigojaluk.sportsontheweb.net/romilademixepizizepazujo.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/netozawajuriwapebijag.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/how_to_cite_websites_in_text_apa_6th_edition.pdfIn PDF document text
    • http://luchdobro.site/how_much_cost_to_fix_air_conditioner_in_cark2gk4.pdfIn PDF document text
    • http://bigops.fun/hp_5520_ink_cartridge_problemtyckc.pdfIn PDF document text
    • http://fuxezaboxekave.scienceontheweb.net/brain_teasers_and_answers.pdfIn PDF document text
    • http://yourcy.com/deluweboxaxinifekapidikidqye9.pdfIn PDF document text
    • http://xonigej.mypressonline.com/ahlan_wa_sahlan_magazine.pdfIn PDF document text
    • http://xviiivbgz.com/ark_fleche_tranquilisante2cwzt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_5b1bc54407b3483693d180433ea35ee4.pdf?index=trueIn PDF document text
    • http://medozazi.epizy.com/habanera_from_carmen_violin_sheet_music.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/gekepa.pdfIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_9b26be9f99c644758b92a2ad882a21f0.pdf?index=trueIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_81ff66f1eb9b43e6a440aa321bdaccb7.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_7f8da94821b24e9eb4bb2d33074b858c.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_c2043eb03cd748acb24497472a8271d8.pdf?index=trueIn PDF document text
    • https://592f3795-292b-4eb7-bb82-ca7d83343d16.filesusr.com/ugd/44d997_dd78e053037d4d558eb81b51510efd99.pdf?index=trueIn PDF document text
    • http://pitalipe.epizy.com/dadiviliwu.pdfIn PDF document text
    • http://tediguku.atwebpages.com/proyecto_codigo_civil_1851.pdfIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_27fd4d06383e43c7917c358b3b0daa6e.pdf?index=trueIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_8f6c18bedf6d418db916601d50e92f77.pdf?index=trueIn PDF document text
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_aa0c95bc2dd6414fa50e931183122877.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 5100 bytes
SHA-256: 7ad90a1702b0f9c773fa311a6889d891d7d53325d9bd84ac27736c8671fd231d
font_01_sfnt_off000105f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 12420 bytes
SHA-256: 2565867c7357d07dcec2747fcb3785eb5651bf63c34d4c7d35026087e3fdbc21
font_02_sfnt_off00012e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7F 16148 bytes
SHA-256: 64f21e55c2f29c6f605e8f9fd96e7f7b34f9b4a26fdc717ddead948457370e3b
font_03_sfnt_off0001438f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333