Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd70e132b48b9b5…

MALICIOUS

PDF

69.7 KB Created: 2021-03-27 21:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 831c9d8397740b79e208eec10b7095c4 SHA-1: 1f54be42806966ced30fef363db779679ac2dc02 SHA-256: 6cd70e132b48b9b5da618fbd33397af20fa327c14f1975fc8731ad2fe77a26a9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one pointing to 'jottigo.ru', suggesting it acts as a lure or downloader. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a payload. The authoring application 'wkhtmltopdf' and the document body's garbled nature suggest it may be a crafted exploit document.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/wix?keyword=planeta42+computer+puzzle PDF link annotation
    • http://baykamif.space/95591891995309cm.pdfIn PDF document text
    • http://tomandbxof.site/hl-l2360_reset_drum358gu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497095/normal_60171e423ad91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481420/normal_6018652ce2157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501980/normal_5fe6c4a55d8ee.pdfIn PDF document text
    • http://ita-bio.fun/dotsure_claim_form33i6o.pdfIn PDF document text
    • http://rusherx.studio/kelikomifitusadanepegr96ll.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475863/normal_5fffc2cf954fb.pdfIn PDF document text
    • http://classkaod.ru/257941112824cuy8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452392/normal_60534c2268b49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473654/normal_5fd2d33479fc5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/699978cd-66a0-4388-bfb5-05c596184123/toro_gts_6.5_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/350964d4-d623-4c65-a51f-0e8d351d687c/the_holy_book_quran_in_arabic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d37f9148-c960-47a6-8295-80caa9273e91/descargar_musica_gratis_de_frankie_ruiz_la_rueda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f85a225-0d19-4322-bea1-392a4a38e9bb/how_to_be_a_certified_nutrition_consultant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2bfcaac-02b4-4eaf-af7d-56c9190a4499/what_is_a_cyber_deterrence_policy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cafd285c-8130-475a-a523-ec98e4fa249a/wafewom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/328b76f6-d7b1-4557-9a34-24f7a283b7b3/is_the_lotus_sutra_authentic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c89f73b8-8c67-4581-97f3-1273f12abcd3/the_exorcist_2004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13435392-1de7-4350-929e-2875fb2f8593/xedesanemubojuliw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d59c6b37-408e-4e5a-8ca5-d5690ff86bb9/list_of_iatf_certified_companies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c73dcb9-a1fe-4970-bd9d-95d4f61f9b3c/the_night_manager_episode_1_cast.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_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 5172 bytes
SHA-256: 68d5f4d78679c298e6380cc9a83fe8d9d293938c6af0479928cabe995c099765
font_01_sfnt_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 10304 bytes
SHA-256: c2c3b2df7be24becd018b9e607cb30592a3ab3e5e45d125534b3034be727a5ca