Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b193e24d31b3de2…

MALICIOUS

PDF

74.4 KB Created: 2021-06-04 07:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: e38090952302702e6b70e9ba3ec2bb09 SHA-1: 9dc0b67263b6ab14468f67805fbb76be06fec46f SHA-256: 2b193e24d31b3de2f9478dc00f5efdf832a92b93b50c2976525f317d2676ac50
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely to redirect users to malicious sites. The embedded URL 'https://chcial.ru/pbw?utm_term=cry+baby+bridge+pa+location' is a primary indicator of the phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://chcial.ru/pbw?utm_term=cry+baby+bridge+pa+location PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456116/normal_5fd1e55ea9087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416786/normal_5fce30fb24b45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420903/normal_5fdf888dbd17b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480393/normal_600c65ea1f5c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419003/normal_5ff2e862543c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456660/normal_606b0ae0e84cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387031/normal_5ff9d30bb3308.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/65faa38c-e54f-4ec0-9c97-f79066010b0d/12802743829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01781c04-de61-437f-87a2-6c62df5f89fb/pukigavezemujoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49bed2cc-c2d1-473b-9d86-c2ce2c973eaf/2nd_order_knowledge_question.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a97fcfe-265f-44fc-ae4e-19792fd175d2/how_to_download_championship_manager_01_02_on_ipad.pdfIn PDF document text
    • http://ludagobef.pbworks.com/f/15718500246.pdfIn PDF document text
    • http://puzavofan.pbworks.com/f/what_are_the_28_fundamental_beliefs_of_the_sda_church.pdfIn PDF document text
    • http://sewafebi.pbworks.com/w/file/fetch/144426522/linear_programming_graphical_method_questions_and_answers.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144446583/gigibixivososedovew.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144451818/38698762795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383aba64-4e02-4c40-9164-df6679a87b87/sefowij.pdfIn PDF document text
    • http://redejok.pbworks.com/f/nagik.pdfIn PDF document text
    • http://barumena.pbworks.com/f/lotuxisowazodevobipezov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b530e9bc-c3b1-428d-9467-9b0be7d1207e/evenflo_tribute_convertible_car_seat_safety_reviews.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_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 5212 bytes
SHA-256: 48847109e6828b7c1625626548bcde684e09332d4b308a0423789e15038cac6d
font_01_sfnt_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 10568 bytes
SHA-256: a1337949c112ddd919b93e2520c453237845911648d055f4009020796fa6b137

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