Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ed27f4e365ee07…

MALICIOUS

PDF

86.9 KB Created: 2021-04-16 06:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cb982876c26b40873813b4b557eb1fff SHA-1: 7feaa465fbc583812125f68ffc0382f1b3a2e869 SHA-256: 55ed27f4e365ee073a2d80f82f0c23d09f975abf51205fc4b85e4a92526802e0
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary focus on 'https://fokemale.ru/strik?utm_term=canon+mp11dx+ribbon+for+sale'. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detection confirms it as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. While no scripts were explicitly extracted, the PDF structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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
  • 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://fokemale.ru/strik?utm_term=canon+mp11dx+ribbon+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383695/normal_602c04a39c5f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479916/normal_6051c9d2030c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369189/normal_600654898f7bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457572/normal_5ff67550152dd.pdfIn PDF document text
    • http://ladunalufim.iblogger.org/did_thoth_really_exist.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486984/normal_606c22930fa3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373248/normal_5fffa58a07601.pdfIn PDF document text
    • http://zirirukefup.22web.org/o_mestre_dos_mestres_augusto_cury_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451955/normal_5fe69a127e7ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470828/normal_5fefe43d34e95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390069/normal_5febe48875fa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416493/normal_6056d11f8c384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411246/normal_605836063c420.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zozasozam.epizy.com/topep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53bcd2e5-a50b-4a26-951e-8beb0b8f41f9/irobot_roomba_i7_best_buy.pdfIn PDF document text
    • http://gejevebo.epizy.com/30193394142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff6e715-14e1-49ca-938e-d646403ebea1/how_to_avoid_premarital_relationship.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/rpg_character_sheet_designer.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/18985120774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db09f42-0c8f-4be7-905d-c1015809f4f4/mla_format_biology_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55d9a5e9-3a5e-473e-9644-8893d0f1ef96/xalozomubisibipubifilex.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/58279158689.pdfIn PDF document text
    • http://wefuzage.epizy.com/76775954902.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/formal_letter_asking_for_annual_leave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c4c1f7e-a8fa-4aa9-905f-1217a22bd62e/86445642988.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/9002313895.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 2996 bytes
SHA-256: fd7ca904a086d7e4d4549ff606d429cf8a246d475548939133b0259e316ca2cc
font_01_sfnt_off0000fee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 5352 bytes
SHA-256: 2944ffb815ba82398d00aa8adbdb09b5f995d7ab6d8f64772b2551c7c022b6c5
font_02_sfnt_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 10824 bytes
SHA-256: 5199946f2a9018da49ff1fe41064651531e611206c6f71579ecd8eae1638c6d9
font_03_sfnt_off00013638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13638 16792 bytes
SHA-256: 4e0aeeb34d13d05adcefa79e6b804a79b12b0b490a5691b22d5d6846d21d326e

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