Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8f246b10fe5dc1…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 23:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1e26cbad2553ad605c2dc022d37a13f SHA-1: fe0d8dbcbc5ce56ad885b28092634852fbb70949 SHA-256: df8f246b10fe5dc1eb5f2354d7bf08d0dc9766776e67f8ed9a4b66ca71d8a8a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm strategy, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it's designed to redirect users to malicious content, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://recviem.ru/img/upload/86385092636.pdf In PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/nuxijiwu.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/28665510746.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/67415283541.pdfIn PDF document text
    • https://rosycaffe.com/file/21953554518.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/14043124716.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/piwewibawafizo.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/93740151644.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/868155798.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/notijukoduvosusazipuwuduv.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1a72bef8c3a8d055fb28c8b656bfb116/31169689000.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/gedamoxenafopunivojigem.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/pazenekizija.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/14rb7j8ecalbnqbm8fagub78e5/bodaranitojilozepev.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/17962237188.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/mijogokinus.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/2694575085.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/sekirenugedo.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210910151124_wgo30m.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-8/20210908225656268018.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nojejoziwefuresi.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/pabelomeruparifejiduw.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/masuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=blox+fish+free+robux+2021PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 10636 bytes
SHA-256: a66278c06f25c08bc44db6853aa7dd52197665196d139c29807eb10972ab96c1
font_02_sfnt_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 17272 bytes
SHA-256: a61759f737cc4371d1934ef1055820ce645a6da8dae52072932157802a6c821c

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