Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bbe808b49106602…

MALICIOUS

PDF

76.6 KB Created: 2021-06-11 22:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 128f8af801995b31052b0a75a1effbbd SHA-1: 509595c5fa3c514569f254f6c3a20a64ea860c9d SHA-256: 2bbe808b491066024193aaf5a47f0010c2ffb9fdb1926232f504ea09d0801b1c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many of which are on disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of an embedded URL and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://drafthe.ru/pbw?utm_term=nihongo+sou+matome+n3+pdf+download PDF link annotation
    • https://gulapizebulo.weebly.com/uploads/1/3/1/0/131070336/9688188.pdfIn PDF document text
    • https://vanuludegevu.weebly.com/uploads/1/3/0/7/130776818/3989409.pdfIn PDF document text
    • https://wezozutu.weebly.com/uploads/1/3/4/6/134653249/5f12840c.pdfIn PDF document text
    • https://sotamepepoj.weebly.com/uploads/1/3/0/8/130874386/5353805.pdfIn PDF document text
    • https://vikisoxez.weebly.com/uploads/1/3/4/7/134712259/f8e8f0d4b94814.pdfIn PDF document text
    • https://lamuxoguva.weebly.com/uploads/1/3/4/8/134882056/5086143.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/fa4eb009-bba6-4b11-8af0-482729359469/colby_spanish_exercises_preterite_vs_imperfect.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/w/file/fetch/144548058/lajaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa656e53-c25a-430b-993e-56e348cd249c/bibajabili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de2f9fa-4d83-451d-80a0-effd7ba62830/23385897979.pdfIn PDF document text
    • http://tezalef.pbworks.com/f/computer_organization_and_architecture_online_course.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144425415/9855918595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5a6ef3b-ba94-4e8e-926e-65ce9252ac8c/by_the_pricking_of_my_thumbs_something_wicked_this_way_comes._open_locks_whoever_knocks_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f35730b-8257-4e32-b658-92522572bec8/how_to_write_my_college_application_essay.pdfIn PDF document text
    • http://bomasasawavi.pbworks.com/f/dubolifokesotezu.pdfIn PDF document text
    • http://zobafolu.pbworks.com/f/download_jdk_for_unity_2019.pdfIn PDF document text
    • http://pitavumiza.pbworks.com/w/file/fetch/144901878/95242946666.pdfIn PDF document text
    • http://tidudirozex.pbworks.com/f/jatuzututapitexoguwujad.pdfIn PDF document text
    • http://lulatigono.pbworks.com/w/file/fetch/144537612/apostles_creed_catholic_prayer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffda2c69-db24-4b2c-ab2e-0ecbb3e8a540/2007_toyota_camry_seat_cover_carid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98f9d9fa-2336-42b7-a90e-f5a6a593e88b/eeo-1_report_blank_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/759fc7a5-7a3f-4ecb-8bb0-6d424c4ad42e/76980852266.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_off0000d5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E4 7464 bytes
SHA-256: 11bf4ab5085124f38abd7dca4fdccdafd143327507227dffd54cc5acd8d3cd61
font_01_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 5584 bytes
SHA-256: ee5965bc8c9bd2012413628e78288377d8886a0d08f328d8f5e51b58bd76940f
font_02_sfnt_off000101ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AE 10228 bytes
SHA-256: 109cf36077dce75ab90054e12bb64fe1b337c6955d74ff4547ff950aae687790