Malicious PDF — malware analysis report

Static analysis result for SHA-256 659ba0552552afd7…

MALICIOUS

PDF

82.6 KB Created: 2021-04-03 19:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 921dd22de4f356d5e3c8539bcf1d8769 SHA-1: 9bfa282cfd1af585c07d83f25074e0ce65d05cf7 SHA-256: 659ba0552552afd7784d13be26866e208d66f306d3609391f42e7f23862b8343
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=sharper+image+wireless+tv+speaker+troubleshooting PDF link annotation
    • https://cdn.sqhk.co/laripikiwafo/ahdCjcr/lock_screen_rotation_on_ipad_air.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466153/normal_604a797d22324.pdfIn PDF document text
    • https://cdn.sqhk.co/vafexifere/NqjiC2g/13629851402.pdfIn PDF document text
    • http://jijimaxugixu.22web.org/segaloxe.pdfIn PDF document text
    • http://luxibenuguk.getenjoyment.net/bubble_sort_algorithm.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/0ghdj9l/video_editor_movie_maker_by_media_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/juxezijafoz/mghcnhb/volofapuzerubojagok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450158/normal_5fc8c0ea57f72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415045/normal_5fdc4f4cd31a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492245/normal_600e65ffc1034.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/boss_micro_br_manual_portugus.pdfIn PDF document text
    • http://jisukizopupez.rf.gd/67010166928.pdfIn PDF document text
    • http://zenakezogutomu.onlinewebshop.net/foxpro_wildfire_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aab9b8e-d97e-458c-a9c9-5c383bcdabc9/lord_of_the_flies_guided_reading_questions_chapter_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/699a9420-f62d-472d-89f8-f234bd79c64f/how_much_for_a_trane_ac_unit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e89dfe81-a2ef-4b76-8111-2b85b2ae9e34/how_to_connect_2_powered_mixers_together.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/ielts_reading_passage_3_educating_psyche_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/american_popular_music_5th_edition_online.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/mercury_110_9.8_lower_unit_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfb38853-b2fb-405b-a826-dce393f44a5d/why_is_the_green_light_flashing_on_my_smart_board.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_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 5692 bytes
SHA-256: 239f2917ff8c1f1b718d7428c65ff9f63720cbf36ec289ce20635406210102ae
font_01_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 12388 bytes
SHA-256: 848eba8f2d39d05d5a602400adac936136f0b1c820058adbf63c0414d5bba665
font_02_sfnt_off00012717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12717 16320 bytes
SHA-256: 9ce469ac9e85fd17b9d5a18e5719c7a7dd023470f8426bc456f958320b59ab77