Malicious PDF — malware analysis report

Static analysis result for SHA-256 091f7744f3af46f0…

MALICIOUS

PDF

96.7 KB Created: 2021-09-23 23:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 51a24334a6c1343dabc01eb803d6e3ad SHA-1: c8f66e1eb2985e798ecbd80d769233590fc02601 SHA-256: 091f7744f3af46f0fef5d96edfcc1b4b874fa4865809809521688cb2807d5db9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, many on disposable hosting, suggesting a phishing or spamming operation. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lrsdev.com/userfiles/file/77066032328.pdf In PDF document text
    • https://nabijdefossa.nl/upload/files/lipusisomuxibelawiza.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/kabuxisufozimolizidekawo.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/bilefazabipegawanimanarin.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/velezepoxapurowafowewop.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/63717100151.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/bemikuni.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/85934566770.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc5a11145---mebinepe.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/bimuvuri.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631897615.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/42515608900.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/5e4cd1b15f9bba7218572f9ec791d5da/65248955467.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/tuzixowaxubikemupus.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/93159666807.pdfIn PDF document text
    • https://kaparatt.com/images/File/siwewatag.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/zafatiduwunenunojesas.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/54591209823.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/wawexodasajajaliwa.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/9767243435.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/ladotenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+repair+micro+sd+card+not+detected+androidPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/55495166498.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://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_off0001149d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149D 18424 bytes
SHA-256: a6a22091a07e69510bcc260e28e12aee273910be93e6f281b77d36c68b542c83
font_01_sfnt_off000143f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C0E 10708 bytes
SHA-256: 79e0b8758c05fcbe6bf43c37bf520042e0b3f6a8f195e65811b3f4905a082ae2

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