Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9af6c177606e12f…

MALICIOUS

PDF

86.7 KB Created: 2021-03-28 15:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3a88baab4312ef1b184e71a04cf643e0 SHA-1: e7ac0f1bf0a59af4a17f16ebd1cc4f73a95f0852 SHA-256: e9af6c177606e12fa59163d88d2e433953de1edd128010ef43b88ab7415200e1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://ponafet.ru/award?keyword=aprendizajes+clave+pdf+preescolar+2020 PDF link annotation
    • https://cdn.sqhk.co/juvebuzizej/agg0QYL/wafeb.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/hhgeEHX/football_quiz_answers_game.pdfIn PDF document text
    • https://cdn.sqhk.co/dubagojovo/Bdgfjfw/wajugerasa.pdfIn PDF document text
    • https://cdn.sqhk.co/lekaguko/jdq4pXD/army_physical_fitness_standards_by_age.pdfIn PDF document text
    • http://topmassage.net/44760862660i5hvv.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/6hiRQhh/gujezamujeromol.pdfIn PDF document text
    • http://mantenancie.com/wemitizekuvewoxivotezamowctyxl.pdfIn PDF document text
    • http://unreguezff.rest/juvevilalekatolomebt5cs.pdfIn PDF document text
    • http://zelopaqq.xyz/nextbook_ares_8a_case4wsqa.pdfIn PDF document text
    • https://jojiwunu.weebly.com/uploads/1/3/5/3/135387754/nubivejalizalabudaro.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/hegfGhh/beyond_the_lights_song.pdfIn PDF document text
    • https://xunedoworevesa.weebly.com/uploads/1/3/1/1/131164322/fb653d69e8c.pdfIn PDF document text
    • https://dojosijodutater.weebly.com/uploads/1/3/6/0/136050104/vonokasazobibab-xugedavazufuba-lifuroxafaze.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/tiiNhiX/fall_guys_ultimate_knockout_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/hlLhfig/basketball_game_download_for_java_320x240.pdfIn PDF document text
    • http://tublitalia.space/stiletto_nails_color_ideasj9qeb.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/kxzBWia/formula_one_racing_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/hbdijgj/79378829562.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f94c0bf7-e5d9-4d9a-a634-00c67e633700/lagijubumalimogagadepix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9db2e4-b5b6-455d-8eea-6381f691f756/fudeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/282597f7-93cc-4621-b3a5-069bc6561f02/xovotakuzazamebafetarilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b95f63d9-d538-4c62-ae28-a1f0303036d2/riichi_mahjong_strategy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72163d5a-ee17-4991-b3a9-a0a1007fa805/76660724804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96730fae-2958-4b52-a3b0-015a2192f03a/juvavukokejikebig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22103d61-7885-40b0-a6fa-eb5fad94d374/76273284827.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 5308 bytes
SHA-256: e3720092b9b963b31ae665cb01d327bbd972463df6d96a5ec1bf482182ad55ae
font_01_sfnt_off00011a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4D 10816 bytes
SHA-256: fb7c33937b1e9fed4c285d89fe1b8e0b5ea4915f7d0f99bfba08d9b8ce6d60ea
font_02_sfnt_off00013d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2