Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f09326aa66c727…

MALICIOUS

PDF

86.8 KB Created: 2021-03-17 06:53:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0199ea4fd56746432de3e5e1baeb0bb9 SHA-1: 5c4b1cfec5719d56e6eee1478b12967cdc897ca8 SHA-256: 20f09326aa66c727c8272406edbbb90687293992b637cd0865781e445238b45d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://golowaki.ru/wix?keyword=icivics+trying+self+government+answer+key PDF link annotation
    • http://heartcenteredequestrian.com/film_basara_season_4_sub_indo5xafj.pdfIn PDF document text
    • http://salonvarna.com/86319071413m1jgg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378149/normal_602484e01bd38.pdfIn PDF document text
    • http://rawenspant.online/47437617672kpr3k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491445/normal_601b6370bba77.pdfIn PDF document text
    • http://tiktoktop.design/bogitadurupuvosusirelesonwfddq.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/22793269371.pdfIn PDF document text
    • http://perfectiona.online/best_cbt_workbook_for_anxietyh2d4k.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/chen_tai_chi_movement_names.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384828/normal_600dc1201fa47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378393/normal_5fe0fb3fc4ef3.pdfIn PDF document text
    • http://girepodemaz.getenjoyment.net/employees_provident_fund_scheme_1952_form_19.pdfIn PDF document text
    • http://kobodesuwid.getenjoyment.net/57015783617.pdfIn PDF document text
    • http://50offstore.pro/53121782167wslto.pdfIn PDF document text
    • http://nikibolerobika.getenjoyment.net/25938043792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464524/normal_602d543419bbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462980/normal_604e0a7bd4f79.pdfIn PDF document text
    • http://masalev.ru/pimugorujudigarupokiwejs4nmq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiwatimab.atwebpages.com/oracion_para_la_corona_de_adviento_2018.pdfIn PDF document text
    • http://gemawinikifiv.myartsonline.com/behavioral_finance_and_technical_analysis.pdfIn PDF document text
    • http://fojosotum.myartsonline.com/padma_bhushan_award_2020.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 5456 bytes
SHA-256: 32526604ef7457adb04d5e71ffd857e1d7a5d3e2b2a360abe7af277b7ebcbcf0
font_02_sfnt_off00011295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 10752 bytes
SHA-256: 6b4ef102e215110e349028034c9add2a3f55729a5bd63d17988b15599b5ffe2b
font_03_sfnt_off00013790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13790 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67