Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b3d45b2c77afe0…

MALICIOUS

PDF

75.9 KB Created: 2021-03-17 13:57:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ad3647844a27e33db7f1157b726ba84 SHA-1: 229c01e1d7a4fe593df96955cd31e3cfb5ac2b47 SHA-256: 43b3d45b2c77afe054d677bbfd67c5adc40236540a7a4469dd8125019445cb0b
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on a link promising information on hacking a game. This strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the document. No scripts were extracted, but the presence of embedded URLs and the overall structure point towards a malicious intent to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://botokaw.ru/wix?keyword=how+to+hack+critical+ops+without+human+verification
    • https://cdn-cms.f-static.net/uploads/4478950/normal_60209a5034196.pdf
    • http://uablog.website/eureka_math_grade_7_module_4_lesson_11_answer_keyvdyup.pdf
    • https://cdn.sqhk.co/piwewupovo/AhfhhdU/91728744338.pdf
    • http://tojipipawerar.22web.org/bacterial_meningitis_treatment_guidelines.pdf
    • http://garant-ritual.online/sims_3_apocalypse_ccwzqgm.pdf
    • https://cdn.sqhk.co/mixenezir/Rjbihhg/jumping_the_broom_film_complet.pdf
    • http://nosinoski.shop/vedam_telugu_movie_online_hd_1080p6ulmr.pdf
    • https://cdn-cms.f-static.net/uploads/4370068/normal_6033aa6052281.pdf
    • https://vumevomuw.weebly.com/uploads/1/3/4/3/134335884/rugabogolos.pdf
    • http://stroiline74.ru/star_trek_enterprise_season_4_episode_12klwfr.pdf
    • https://cdn.sqhk.co/devisofage/Ngejgjc/amazon_discount_coupon_code_for_books.pdf
    • http://sedouche.xyz/14242573650cveo7.pdf
    • http://pexukakadom.22web.org/the_new_oxford_picture_dictionary_intermediate_workbook.pdf
    • https://cdn.sqhk.co/kobewudojuvo/iajjMhj/airport_companion_pass.pdf
    • https://cdn.sqhk.co/gonolesuzam/id3G9Rm/zeraki_learning_apk_download_for_pc.pdf
    • https://padawevuwelidas.weebly.com/uploads/1/3/1/4/131438111/zutewegilozuteniwazo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0d131174-69fc-4b64-b94a-356eb54c69c0/75810738078.pdf
    • http://fesipuzidotunep.rf.gd/big_data_course_syllabus.pdf
    • https://uploads.strikinglycdn.com/files/5475ef3f-ad73-4085-bca8-c594b6561e93/77132946581.pdf
    • http://tutujuk.epizy.com/nivegakiwilepa.pdf
    • http://judewal.rf.gd/tipibigogiwugipabize.pdf
    • https://uploads.strikinglycdn.com/files/76da8589-ccf2-4507-96bd-2dbda5c41221/english_vocabulary_size_compared_to_other_languages.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c3.bin
ce089c8e589503992dfa1904be10e39151ee40c94da41a5420b6f4609a7ad1cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 5432 bytes
font_01_sfnt_off0000fc2b.bin
afab15c1b22a614787f88400eb2b2eb3de782db3b79166415cd233f3c6fe2368		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 11116 bytes

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