Malicious PDF — malware analysis report

Static analysis result for SHA-256 c263f4f3e9ba5ca1…

MALICIOUS

PDF

83.7 KB Created: 2021-04-03 10:40:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0d92d80b68436b8faffc9bea62bbeb5d SHA-1: 9fa9996f4d7252bef9ee2377960345aa68c38f17 SHA-256: c263f4f3e9ba5ca1fadf60bdec98a2b3d305d04b3ff7b4cc9a303dc78ba2eed0
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/123?utm_term=project+report+library+management+system+documentation PDF link annotation
    • https://cdn.sqhk.co/mevazasid/qjgjfQV/microsoft_movies_my_library.pdfIn PDF document text
    • http://stakingyfi.com/besumem6yre5.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/6KEhckD/celestial_meaning_in_hebrew.pdfIn PDF document text
    • http://nubolats.xyz/libab6pgd9.pdfIn PDF document text
    • http://bonifacy.site/rasidaloml110q.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/eSifzoP/word_domination_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/bipokagiti/7uMK7jf/43106189734.pdfIn PDF document text
    • http://brandframeb.com/juksekoder_for_farmville_2_penger_p7cony.pdfIn PDF document text
    • http://replyua.site/49919280459tzsug.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/NXijTgf/kajatusumipelixovuzajexe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://vepilezora.epizy.com/amhara_region_map.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/4758447999.pdfIn PDF document text
    • http://xirotowukutizu.epizy.com/vobobobimufawiderinewabot.pdfIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_d516f055bf2d40b7b1a07c5c873ac2df.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_50dc7e99655945cba5548f0af089e89b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/xekabonosufirazisusisun.pdfIn PDF document text
    • http://minalemifomoni.epizy.com/rojudiji.pdfIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_369fc6978b894dc0b8cf32b0bbd19c16.pdf?index=trueIn 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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 5712 bytes
SHA-256: 170715e3131e122baa1633cd6753ea58e4e561c2aa7adc3b29332966dcf10d02
font_01_sfnt_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 6300 bytes
SHA-256: 25dace31141bc12a214a9539ff282d490dab3748c32c7de26b80eb6398fbab3d
font_02_sfnt_off00011d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D89 10432 bytes
SHA-256: 25635f30ed50d7e3557108f9877a87d0f3cc7acfcd2e409f57da9d579413e2bf

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