Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23a3298003085f2…

MALICIOUS

PDF

114.0 KB Created: 2021-03-28 00:19:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ea99fec0f29be790c18fefd21073bc23 SHA-1: a7fcb11795b938a70d10eac5eb6ee525549bf6b1 SHA-256: f23a3298003085f2405c7a8cc7e5dc110f6dc8f8fa95b6c5a5443f4c2cc20442
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9997

Heuristics 5

  • 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.
  • 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://xajibur.ru/award?keyword=absalom+and+achitophel+full+text+pdf PDF link annotation
    • http://zugapuvu.mywebcommunity.org/godepepurotofu.pdfIn PDF document text
    • http://qunit.space/boxepubomozawuxikanek7cmmw.pdfIn PDF document text
    • https://cdn.sqhk.co/xufuwejaxe/haUguhc/baby_alive_accessories_at_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/ih7iiib/58127575313.pdfIn PDF document text
    • http://housefashion.ru/relentless_hamish_brewer_book_study7np8t.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/internet_and_intranet_engineering.pdfIn PDF document text
    • http://erogan-oficial.site/zalebesagufr9x1.pdfIn PDF document text
    • http://1xbet-football.fun/download_film_divergent_series_allegiant_sub_indo950sr.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/retufopejabodilu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nabeput.epizy.com/mogene.pdfIn PDF document text
    • https://8459f3b7-b2e6-4b58-af31-5f29adf293b7.filesusr.com/ugd/a68450_203e910e69b94202a03f6a043bb5a57d.pdf?index=trueIn PDF document text
    • http://gixarewujedel.atwebpages.com/waterfall_model_in_software_project_management.pdfIn PDF document text
    • http://xupimegoroze.epizy.com/gemutusunaxiwupatugefim.pdfIn PDF document text
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_ee0e0606e43041d6ba1631357f6f97e1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/67849685431.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/722495088.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/71424483100.pdfIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_4de33a9cc3124b4c98d7909ef8c81880.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17614 5380 bytes
SHA-256: 01b222386c124e34057f0df4d90dff1ed06b6d9c3b6b8716528600de148437be
font_01_sfnt_off0001882f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1882F 10796 bytes
SHA-256: 88ce9bc6934fcaf0d815d87f9197949a185cb71416a0b7e28411990bba447d29
font_02_sfnt_off0001ac9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC9A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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