Malicious PDF — malware analysis report

Static analysis result for SHA-256 8801d444d9ebfffb…

MALICIOUS

PDF

76.9 KB Created: 2021-02-27 06:58:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: e5b3f517191a205446334fd0eb35d1bc SHA-1: 1385e63a162b3e39055108afbf3f30baa88bb31b SHA-256: 8801d444d9ebfffb454f12c2a3ea26c5be63db35b75a4df5a4e736f618cd0ff3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a worksheet, which is a common lure for phishing attacks.

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://vilenefex.ru/wix?keyword=passive+and+active+transport+practice+worksheet PDF link annotation
    • https://cdn.sqhk.co/nebemina/cht9sdA/kexozazenunosugadupodo.pdfIn PDF document text
    • http://gavewedek.iblogger.org/bs_player_linux.pdfIn PDF document text
    • http://snatural.space/japesorimufulezos0fc.pdfIn PDF document text
    • http://zakukat.iblogger.org/elements_compounds_and_mixtures_webquest_answers.pdfIn PDF document text
    • http://zuferiwabofeg.22web.org/california_lottery_prize_claim_form.pdfIn PDF document text
    • http://sun-italy.space/64630125343h4iz8.pdfIn PDF document text
    • http://qiwi-wallet.online/los_30_derechos_universales_humanos_suscritos_por_la_onurx79j.pdfIn PDF document text
    • http://vofufime.mypressonline.com/twilight_2008_full_movie_in_hindi_download_720p_openload.pdfIn PDF document text
    • http://tuxiwos.iblogger.org/energias_renovables_no_convencionales_en_chile.pdfIn PDF document text
    • http://kejamezegujoz.iblogger.org/liwajomotafodolagarosafap.pdfIn PDF document text
    • https://suzazega.weebly.com/uploads/1/3/4/4/134476369/5a2cc872f025f.pdfIn PDF document text
    • https://miduginoxem.weebly.com/uploads/1/3/4/8/134892771/rawapofowel.pdfIn PDF document text
    • https://pegavuvusejeda.weebly.com/uploads/1/3/1/4/131483027/2252573.pdfIn PDF document text
    • https://cdn.sqhk.co/japokaxe/hei2ja2/electronic_protected_health_information_system.pdfIn PDF document text
    • https://mefufexuwi.weebly.com/uploads/1/3/4/0/134019004/tumibivop-pusepebitoja.pdfIn PDF document text
    • http://vabuletarikinil.iblogger.org/pejosijobegize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wulimazef.epizy.com/brinell_hardness_testing_machine.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/sandisk_wireless_flash_drive_software.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_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 5348 bytes
SHA-256: d8072f8b84ce22f61e3c08c2a491549fa6e82dcf09982e6a3a4a5e0d3db996ac
font_01_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 10396 bytes
SHA-256: 5d89b707b7c07bc8fab80d9f36ae6b3bff779f0595961663194078d9861d7e19

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