Malicious PDF — malware analysis report

Static analysis result for SHA-256 d911e98d881adf06…

MALICIOUS

PDF

85.0 KB Created: 2021-03-20 05:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d0cdf7a4532de75e3d331965be4fe4d6 SHA-1: 835de0aa8c4044357fc47d7be540d66bebb6a26e SHA-256: d911e98d881adf06650dd04ab716f8d94ef8c393c61d9bb24afabb29f3e9a5ca
186 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. 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 0.9991

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://pelibifir.ru/strik?utm_term=is+a+smith+and+wesson+9mm+a+good+gun PDF link annotation
    • http://medtechnika1.ru/corona_render_for_sketchup_freembvfu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382966/normal_5fcf6ca900bda.pdfIn PDF document text
    • https://kazefapakoj.weebly.com/uploads/1/3/4/6/134644741/xipagulutudifa.pdfIn PDF document text
    • http://iciko.xyz/wofufesopalelibupabarf8ve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_60134b812860e.pdfIn PDF document text
    • http://fitness1.space/what_is_the_most_accurate_bible_translation_from_the_original_textnd268.pdfIn PDF document text
    • http://iglivesupportteam.com/bbc_food_guide_pancakesgg4ld.pdfIn PDF document text
    • http://koreatop.ru/financial_accounting_terms_and_definitionsbu5r6.pdfIn PDF document text
    • http://usacreditmonitoring.info/sda_church_manual_2018_downloadc6frs.pdfIn PDF document text
    • http://vinnipoh.space/23199864017s4sab.pdfIn PDF document text
    • https://nimukebobe.weebly.com/uploads/1/3/4/5/134527887/79385e72f814.pdfIn PDF document text
    • https://wujuzuvetawi.weebly.com/uploads/1/3/1/3/131379059/907354.pdfIn PDF document text
    • http://mediaverifiedbadge.com/what_to_eat_elimination_diet6bifu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381543/normal_5ff5783bef6a0.pdfIn PDF document text
    • https://xopozutafedas.weebly.com/uploads/1/3/1/4/131453480/tusisazunuzutos_roviniwot_bodibo_pekese.pdfIn PDF document text
    • http://esclub.info/507286870377uyh5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409092/normal_5fc5ffa97b563.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://38c8c62e-1823-4c1e-8220-bc61efcc8a1c.filesusr.com/ugd/c24b9b_f41c329b9fba450587e5a9aff7da7bc4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dec65e4-7fb2-4914-98c4-5fbfee3ccee0/mivovixegikaf.pdfIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_b9cd3af65d07477ea5d69a705671b550.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb06f56-4176-4862-99ff-6eaf51156bd7/wosuxuguvobalujijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/603870ce-6f44-4173-b456-adbc18c98fa5/28709167957.pdfIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_9c5f4d9324c14b1f9e74a3a93212c7fc.pdf?index=trueIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_5867d895518a4cd8a783ac33cbfc7ba9.pdf?index=trueIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_5720a5446eb545788933415376c7ef1c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 5296 bytes
SHA-256: 28910360b5f213a9e9086b092ca74a5512822531714daa0488c2865678cada7a
font_01_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 11168 bytes
SHA-256: b96bfe4551a7db33e267a44e047ba4b09ed3c0c51e6c07e0d721475d7cadb259