Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e8e76eb21f498f…

MALICIOUS

PDF

57.9 KB Created: 2020-10-07 07:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 2f809946f9dd2db81a9beb4c951be4fe SHA-1: c56c5642b3852641b124910de3f668462963f1a2 SHA-256: 40e8e76eb21f498f7f5183e9f73bd7235187ea596dfc974c9bd7411af414e686
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?keyword=filosofia+para+principiantes+rius+rese%25C3%25B1a In PDF document text
    • http://sarelodi.tylerversluis.com/uploads/1/3/1/4/131437987/7736317.pdfIn PDF document text
    • http://nomove.rootandbranchcollective.com/uploads/1/3/1/1/131163992/sesogeluv.pdfIn PDF document text
    • http://files.beckycarlylebooks.com/uploads/1/3/1/3/131381605/repufetonuferodeke.pdfIn PDF document text
    • http://files.dyslexiaadvocacyactiongroup.org/uploads/1/3/0/7/130776321/puvimalixodosifemala.pdfIn PDF document text
    • http://files.westminstercares.org/uploads/1/3/0/9/130969932/6420184.pdfIn PDF document text
    • https://site-1038796.mozfiles.com/files/1038796/begimate.pdfIn PDF document text
    • https://site-1040144.mozfiles.com/files/1040144/votozasojidavuxewag.pdfIn PDF document text
    • https://site-1048288.mozfiles.com/files/1048288/biwuxudesegivimegav.pdfIn PDF document text
    • https://site-1040609.mozfiles.com/files/1040609/16662061809.pdfIn PDF document text
    • https://site-1040400.mozfiles.com/files/1040400/vijuvuxajajaxupunaponi.pdfIn PDF document text
    • https://site-1039290.mozfiles.com/files/1039290/bugaziwizokabonegibode.pdfIn PDF document text
    • https://site-1037893.mozfiles.com/files/1037893/64038519494.pdfIn PDF document text
    • https://site-1036676.mozfiles.com/files/1036676/15557624299.pdfIn PDF document text
    • https://site-1037881.mozfiles.com/files/1037881/wafikamutefokopot.pdfIn PDF document text
    • https://site-1042824.mozfiles.com/files/1042824/zilemesasuxara.pdfIn PDF document text
    • http://nilunador.lbfs.org.uk/uploads/1/3/1/3/131383323/bujuranupofe_lokemibepu.pdfIn PDF document text
    • http://wakiviz.houstonhighschoolptso.com/uploads/1/3/1/0/131070340/3013116.pdfIn PDF document text
    • http://files.richmondadvisors.net/uploads/1/3/1/4/131453598/ce826064b9.pdfIn PDF document text
    • http://kumar.artoftherush.com/uploads/1/3/0/9/130969300/datinorenedamifuj.pdfIn PDF document text
    • http://files.fera-lab.net/uploads/1/3/0/8/130813650/2623547.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000a061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA061 5176 bytes
SHA-256: cbb583dea7e131488b5e0bf132bbd79b4a8d9a7919c339a0234b5e858172e776
font_01_sfnt_off0000b1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D0 11584 bytes
SHA-256: fb06ea364f68ef1afda7ba980db5dc0db0b5cdb0dc7ace5b9848f18cb8102ab7

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