Malicious PDF — malware analysis report

Static analysis result for SHA-256 7850eb939d774a19…

MALICIOUS

PDF

73.5 KB Created: 2020-12-31 01:15:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9505f2931f13c99104b4311df0d11431 SHA-1: 3d71c722e4a9f7b937da80edbd2c8b9f7f9b6b93 SHA-256: 7850eb939d774a19e6ceb824ba9b549e42be3e866bc170735afbc087093e1f0e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=furniture+modern+minecraft+pe In PDF document text
    • https://zupawifotifawe.weebly.com/uploads/1/3/4/4/134480263/xavuwupuzeg-tirotofuguxe-jikaluxufenajo.pdfIn PDF document text
    • https://cdn.sqhk.co/fabukujeb/hjeXniP/49175010600.pdfIn PDF document text
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/xalutos.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/16c52ccf-01ba-428e-8a80-2b7fbbe5a497/fesobujuziseneni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16755fe1-dd0c-412f-b28e-b7a39fcd8ff1/reduxaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/998a6b6d-e380-47eb-bb6d-7c7923cb4405/44735546772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef98507a-cf63-46ba-9f45-19dec27f6dcd/22827908761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/670fcafa-3517-4c92-9c67-86f47904f489/pennington_county_jail_inmate_visitation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1c77952-e5b3-45c9-b358-09a9120c11c9/mixidalujilimizosebuwomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11c5acb4-1d9c-4f66-a925-9699b2ae4221/51275068589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a41160f7-39d7-428a-8dc1-e8dde322b8ef/feedback_in_the_communication_process_can_be_either_intentional_or_unintentional.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74685f6a-11a7-422d-ac1e-cbbdc2653235/police_department_administrative_assistant_job_description.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7D 5044 bytes
SHA-256: d69fe3e066736594c0b5b7345c75bc5067f5e88fc845cbd4d24fd33b690a56c6
font_01_sfnt_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 11088 bytes
SHA-256: 1dad37f6e686c5a318db6bdbfdaec628d429f777dbe573b992f633828e6965e2
font_02_sfnt_off0001042a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 16192 bytes
SHA-256: eb29371a9263d1efed02b1533fb53138ee823a98fbd078e52407dfdd24d7a728

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