Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2df1d8907bc110…

MALICIOUS

PDF

79.4 KB Created: 2021-04-10 02:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b392940a43058cce9de845f5b4414e90 SHA-1: b0b651fdd642c57915196df0d0a5e0ef1e3d1685 SHA-256: ca2df1d8907bc110fb1eb8545a15b2556b0a48104a198f043540c3a21b7b71cb
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 0.9990

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://golowaki.ru/strik?utm_term=skullcandy+soundmine+won%2527t+turn+on PDF link annotation
    • http://ludirobus.getenjoyment.net/45766258817.pdfIn PDF document text
    • http://novofikupeneda.mywebcommunity.org/75199849270.pdfIn PDF document text
    • http://kimagibasip.22web.org/php_one_button_submit_two_forms.pdfIn PDF document text
    • https://poturifipejo.weebly.com/uploads/1/3/4/7/134767967/8539334.pdfIn PDF document text
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/miroru_dibavimuj.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/vekuguxedisasege.pdfIn PDF document text
    • https://bovopoboj.weebly.com/uploads/1/3/0/7/130776351/1b7aaf3c3.pdfIn PDF document text
    • https://tonewebebajuja.weebly.com/uploads/1/3/5/3/135319275/7a222f4a206947.pdfIn PDF document text
    • http://bakevez.22web.org/lasepuvokigometas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_c40976d8df0e4fa991e6ca44bce58049.pdf?index=trueIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_a26b493cde3c4b539affa20a6f9861bd.pdf?index=trueIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_67972b14970043f48cd89b843d5de395.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_820cd929297846cb9baad3c2c4d6baa7.pdf?index=trueIn PDF document text
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_142876af83a2496fabe8fb8cc88ce07b.pdf?index=trueIn PDF document text
    • http://puligop.epizy.com/sample_monthly_budget_excel_spreadsheet.pdfIn PDF document text
    • http://vakisetituli.rf.gd/11913436129.pdfIn PDF document text
    • http://ketagarewetene.epizy.com/patofisiologi_anemia_defisiensi_asam_folat.pdfIn PDF document text
    • http://buzanuziti.myartsonline.com/analyse_financire_approfondie.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_a3825cfefc604bfea9c98e8d0e603ce9.pdf?index=trueIn PDF document text
    • https://eb9d0a7c-f241-4274-9260-18def620c3fd.filesusr.com/ugd/796b85_b45ad68d35c94a2b862262dcf1cfb2b9.pdf?index=trueIn PDF document text
    • https://4fd47d7d-96cb-4cdc-943f-55997d715fc9.filesusr.com/ugd/ab3424_a3a852e2f36e42558b969378352e8a42.pdf?index=trueIn PDF document text
    • http://sezirinizisa.rf.gd/veboxotokumo.pdfIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_c9fb8741f8564832b61b1ad581ff0912.pdf?index=trueIn PDF document text
    • http://rubabup.epizy.com/jurnal_biota_laut.pdfIn PDF document text
    • http://petejubetitoma.rf.gd/yamaha_dgx_660_guitar_center.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_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 5480 bytes
SHA-256: 7a99b983039dbe8e60a287d6c0443b70649464c85905a1beb49b5288d0c91320
font_01_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 11280 bytes
SHA-256: 24eebbc3c55c5741c33240dda1955f65151a7125cb3095a74b986a91fc0c1ab6