Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83b2fb831d21b2d…

MALICIOUS

PDF

68.1 KB Created: 2021-03-10 17:10:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d33ea35f81674ab3bfab4e0a76b2c41d SHA-1: decd0f28d40c8dc71babc14dc8e32f028daccbb9 SHA-256: e83b2fb831d21b2d3097fd5106f021e746426c9c6845923a77d84ba38c30efab
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://soxebez.ru/123?utm_term=national+gypsum+xp+sheetrock PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481831/normal_5fdf391c1328d.pdfIn PDF document text
    • http://mailedflkf.site/83071450374prahm.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedepobe/k4ogdlW/phishing_report_to_google.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530910/normal_601199d01d4fc.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/whiRQij/87699017933.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/x6t1heX/45497036471.pdfIn PDF document text
    • http://sarkife.site/alejandra_pizarnik_in_englishji69j.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/0KLx94v/pokemon_go_promo_codes_working.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenilu/5TMRieR/posanadiguso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_f70bd6ad5fcb497892ec34a77d049380.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_4687ecfb933747c09893d1921b4f5d95.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_b9b90f7a546e490aab924356950b02fe.pdf?index=trueIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_cfb31511f1c4459292f573119a3503db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab960681-3ab5-4a58-81e0-25aca4eac017/40738251343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b247e8f3-149e-4c9a-b47c-afd2f9ef61a7/the_5_love_languages_for_singles_quiz.pdfIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_38b2c93f81244aed953320f5b4780b69.pdf?index=trueIn PDF document text
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_901dbdc574e34765953a22ffca9e35e5.pdf?index=trueIn PDF document text
    • https://f766a7e9-a0d0-4e3a-bf7c-946d2e8c2ff4.filesusr.com/ugd/bddb96_f13dd31b012e4f0e9bff4a8c64e49ff3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5172704-4f96-4a01-a5bd-7ad7a7eca43e/dolls_house_act_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/071e8c59-bdbf-469d-b217-704e2e6317d9/diccionario_biblico_cristiano_gratis.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_0f90fee4079943cd9e3768069845f1c2.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC58 5552 bytes
SHA-256: 8c5963b9f0e99929baa11dcb4a6484be5832558d8641efbbff63199ccad3a538
font_01_sfnt_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 10620 bytes
SHA-256: f7745fe849859f115784e64bbcac96c1d5d7efcbd13eaf7872c84d6b6b026882