Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5e3791b6b37ce8…

MALICIOUS

PDF

82.3 KB Created: 2020-11-26 09:09:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3532e60cf5515b00c49bb663373c5a8d SHA-1: f98bafc111891124aad17de8f0c7cf71cf7dc2a4 SHA-256: 4c5e3791b6b37ce802c9f33de913b1ceb7e4fef12443f5f4442cdfcd56dd543d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various platforms. One of the initial links redirects to a known malicious domain, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://cctraff.ru/strik?utm_term=nursing+care+plan+fluid+volume+deficit In PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/kevagadodo.pdfIn PDF document text
    • https://munulibur.weebly.com/uploads/1/3/4/5/134508804/domoxij_femorukod_kuxazajesejewok_wutawomejoxa.pdfIn PDF document text
    • https://jolefopasovoja.weebly.com/uploads/1/3/4/4/134402584/rinigudosanurizisi.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/0d0b2c13be1.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/9a94d49f-a103-4647-a65b-6d648ecbeaca/kevitikabirotoko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca914fe-afdc-43b1-b210-e622a152e964/xaguz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e45140f-d0e4-4741-9519-79c99938c6a6/panedufowitaxefejekuzijix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3116be-0c83-4321-b1f5-bb6a5c2456f0/sewit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c795625-c7c7-4427-81ef-d4aaaa29be52/flexiquiz_las_cuestiones_y_las_respu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/314e2ffb-44fa-4a71-a3c1-1ad58afe5197/2001_honda_accord_ex_v6_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/tea_teaching_certificate_lookup.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/burnout_ps2_game_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6796a985-d20d-4180-8859-2f4ec3d25e95/41737157875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1fe9173-267b-4812-93d1-ea97cb486e84/pokemon_mega_power_walkthrough_part.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be3946dc-3b7e-46fa-8de3-fee94516c78f/32568703552.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_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 5504 bytes
SHA-256: 60474071fe42c6663c08d3452cfd79aea7cb347a461b7f8391a5188372ac992e
font_01_sfnt_off000116d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D0 11180 bytes
SHA-256: 14d2fcc6a16a0a64776178a3669a16d8a71059543013153b37aa2ede33460a7c

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