Malicious PDF — malware analysis report

Static analysis result for SHA-256 790c6bdb6693330b…

MALICIOUS

PDF

88.7 KB Created: 2021-01-22 06:39:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 47aeb188277aac846048a762b9544e20 SHA-1: e495d6eae5a1a0679316c8ed366366cccce2e372 SHA-256: 790c6bdb6693330ba65f8988556226675fe1ed4f5da58a602eda040d31f4168b
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirectors, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=servlet+interview+questions+and+answers+javatpoint In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_5fd1c1278ee20.pdfIn PDF document text
    • https://site-1168207.mozfiles.com/files/1168207/bee_movie_2017_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417141/normal_5fe611e832f77.pdfIn PDF document text
    • http://nisisigewu.iblogger.org/74762021263.pdfIn PDF document text
    • http://lujuvudav.22web.org/medical_terminology_the_basics_practice_exercises_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/ihFKhhj/solucion_high_school_escape_level_8.pdfIn PDF document text
    • http://waxinexedodupij.22web.org/73720012390.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415531/normal_5fc9ee70ecad8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387928/normal_5fc59a1a0c72a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388820/normal_6001071826ef7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487918/normal_5fc5c9581de7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410988/normal_600867fa83407.pdfIn PDF document text
    • https://site-1178139.mozfiles.com/files/1178139/sad_shayari_image_hd_new.pdfIn PDF document text
    • https://site-1178504.mozfiles.com/files/1178504/tic_tac_toe_python_youtube.pdfIn PDF document text
    • https://site-1166710.mozfiles.com/files/1166710/fukijuxofad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465705/normal_5fcba5d6cb798.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
    • http://xobiluwova.epizy.com/56881242565.pdfIn PDF document text
    • http://jonegukum.epizy.com/materials_requisition_slip_template.pdfIn PDF document text
    • http://fovelemuzawela.epizy.com/18221406066.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 5292 bytes
SHA-256: c63d038ad7a21ef8f47fb59afe8265f523ae92add777043bb85f59190bd9c792
font_01_sfnt_off0001234b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234B 10464 bytes
SHA-256: ed6a2fb4a4ed0420e2832a914b02821350d31358a4ccf441ce62e6e2b3537f2f
font_02_sfnt_off000146dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3