Malicious PDF — malware analysis report

Static analysis result for SHA-256 353dea6be89a1c2d…

MALICIOUS

PDF

90.8 KB Created: 2021-02-13 21:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 0e9e67fc0d18ba901e2f1076696c688e SHA-1: bbb0df435aff836a50d29c8e3928c98c4724032d SHA-256: 353dea6be89a1c2db29c6bfc05a1bbf5ac0f4a05d720112bd3978d9c483ec3ec
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'maypoin.ru' and associated with game-related keywords, suggesting a lure for users interested in those topics. The presence of a link farm heuristic further supports the classification as a malicious document, likely used for phishing or distributing further malware.

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
  • 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://maypoin.ru/wix?keyword=cheat+engine+binding+of+isaac+afterbirth+plus PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421468/normal_5fc69f87da6b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5fd929717b15b.pdfIn PDF document text
    • https://cdn.sqhk.co/vetesomiw/rtihhcg/views_counter_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/ifhhR7o/puwowigape.pdfIn PDF document text
    • http://numidib.22web.org/tedimuwuxenoxetok.pdfIn PDF document text
    • https://cdn.sqhk.co/kovezozeseg/1jhYCLu/chargepoint_apple_wallet_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/j6giHmF/ligifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_60178e3da8f24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391315/normal_5fdd23baf1a04.pdfIn PDF document text
    • https://cdn.sqhk.co/razefudixid/XYSaqtS/cbse_class_9_sst_deleted_syllabus_2020-_21.pdfIn PDF document text
    • https://cdn.sqhk.co/repejuvovod/7ijciTc/bepixejikadipafokipajokav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422371/normal_601fec8ea5804.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/pewibim/agnus_dei_music.pdfIn PDF document text
    • http://wazubumuxige.rf.gd/gambar_aku_lelah_dengan_semua_ini.pdfIn PDF document text
    • http://genenapukiral.epizy.com/wilanifamujubumevawupuned.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/play_android_games_on_pc_windows_10.pdfIn PDF document text
    • http://toreruvevow.epizy.com/la_isla_bonita_lyrics_video.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/44953802386.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/66026634883.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/17581365592.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001184b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184B 5464 bytes
SHA-256: f028bd7e2648e114c0aa5ed7bd9a722d907b38ae07133de06a6fbce9a86d3fd1
font_01_sfnt_off00012ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD3 16352 bytes
SHA-256: c8d4c573a34179a556b0e8aef8ccf805454e844494febe346e06eed7be34a486

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