Malicious PDF — malware analysis report

Static analysis result for SHA-256 b405842aa141c53b…

MALICIOUS

PDF

86.9 KB Created: 2021-09-09 03:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50471584991a94f66049be092fb86b25 SHA-1: 62fcbb7109c4558004ce4d01962cfca9bd3b1ec1 SHA-256: b405842aa141c53b225f9ec2d07078bf27192cd5315700b6e1244fd07d234529
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to disposable domains, and a heuristic identified it as a link farm. A visual download button lure was also detected, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://livbiopharma.com/userfiles/file/96154332030.pdf In PDF document text
    • http://purepassion.pl/userfiles/file/wojakujomezusixolix.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/badagisofasuselumaji.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/surimusivovigotutumin.pdfIn PDF document text
    • http://xprchemical.com/upload/files/bawudasaxabavilosobekogel.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b233babd50bfac27fc361e8723803856/badalodekuxuwavizo.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/58893456433.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/sodipofeximagobewuwopetas.pdfIn PDF document text
    • http://msiutilities.biz/documents/lanedefebew.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/biroduvixojopuxemif.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/zadunekoboxabozanojapa.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/wunafizulikoxadugosevulo.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/78661656015.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/juwonapametafajobataxezuk.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/60084307737.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613682a70d7c7---3953224960.pdfIn PDF document text
    • http://linza-market.ru/upload/files/xelibofe.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/ferige.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/35245991428.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/pumovogofedapagapojuwal.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/22621790796.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/zavodujunogajinetizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+box+install+apkPDF 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_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 10568 bytes
SHA-256: e9abc9185a1d32f75f0af9eaec9f44b582709ca214dee18117e16cb3606563d1
font_01_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 18720 bytes
SHA-256: 6e5ebbba8628b1b74e73348218c49c8f9f41e2539a235a05283b5edac99309e8
font_02_sfnt_off000135f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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