Malicious PDF — malware analysis report

Static analysis result for SHA-256 963bbf5ffc6cf27b…

MALICIOUS

PDF

85.7 KB Created: 2021-03-25 12:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 73211858c0a4381ed393ad37a0c4524e SHA-1: b515ddd74f5f49d05e967c347726aa17549a73fd SHA-256: 963bbf5ffc6cf27bb21804a92cfc6cb52f510af103fa9fdba45aca1d9b343627
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'midufefew.ru', suggesting it's used to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for link farms, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://midufefew.ru/123?utm_term=sorting+algorithms+cheat+sheet+java PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424672/normal_60171f14371ce.pdfIn PDF document text
    • http://fixalab.22web.org/dirt_bikes_for_sale_toms_river_nj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369158/normal_602d41057dcf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421062/normal_6043ea3eb5d83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387417/normal_603515805772d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373526/normal_5ff2abdff36c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_6033f70b0e17b.pdfIn PDF document text
    • http://vegefojafi.22web.org/la_vie_en_rose_piano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459025/normal_60021542e2fc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413573/normal_601ff7ae9a263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_605a7108a5555.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bapexuzajo.epizy.com/33584526709.pdfIn PDF document text
    • http://bibebebimil.epizy.com/365_day_drawing_challenge_list_2021.pdfIn PDF document text
    • http://bemogabidemixu.epizy.com/7673384527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/598b63e4-63bc-4934-a5ac-18c9c6e4fdfb/976709022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1881e9ec-48fe-4019-958b-79b08982ce57/holt_mcdougal_algebra_1_chapter_3_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f2d1a1-958f-4e99-89bf-e76399090ebc/how_to_make_caricature_in_photoshop_cs6.pdfIn PDF document text
    • http://gajovab.epizy.com/latin_name_meaning_answered_prayer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4a2b5a-f444-48a9-9912-b913d5f919a4/sukhmani_sahib_path_in_english_book.pdfIn PDF document text
    • http://zazifikas.epizy.com/uc_browser_for_tv_apk.pdfIn PDF document text
    • http://gugosezufuted.epizy.com/bsc_agri_biotechnology_syllabus.pdfIn PDF document text
    • http://zarudab.rf.gd/danielle_steel_book_list_2019.pdfIn PDF document text
    • http://fegerig.epizy.com/why_riba_is_prohibited_in_islam_and_what_are_the_rationale_for_riba_prohibition.pdfIn PDF document text
    • http://tijopuzotozume.rf.gd/81983549373.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_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 5452 bytes
SHA-256: 24067cd99334ef078e15f020fdd0cd4d1bbdcd4a948fe0c7c8f3502ea46ab24e
font_01_sfnt_off00010aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAA 12156 bytes
SHA-256: 197da5a772cce105e13f074a0eabab0f9022571d7ee1d1110bd53a540b5c9392
font_02_sfnt_off000133c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C3 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b