Malicious PDF — malware analysis report

Static analysis result for SHA-256 b111632a67284490…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 09:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25c5a886f15542782dd6d40842b2a5a7 SHA-1: 86d80e7585e50f81bac96a6bdaf6e004650de372 SHA-256: b111632a672844907e74caf78945581fb9fb0b94682d81ac78a9142bb212e9a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan' and by an ML classifier as malicious. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a link farm or redirection mechanism designed to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://desense.eu/uploads/wysiwyg/files/bofusumaw.pdf In PDF document text
    • https://distriparkbotlek.nl/userfiles/files/wukoripet.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/51554960846.pdfIn PDF document text
    • http://szwygs.com/upload/fukozekadosetisafirano.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/52468353694.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/81846545187.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/bovunalawinezod.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/39109772244.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/petexajinizoxotibisodura.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/fomatelovogutawubowol.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/15666128624.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/wezusinuduralugejexopamod.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471f72604c8---jadotomugovejes.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/66596421910.pdfIn PDF document text
    • http://uteambio.com/upload/files/62292440818.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/budusel.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/55247552416.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/jakutikazazatagazemog.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/6017578713.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/zumexesadopobi.pdfIn PDF document text
    • http://zuche0551.com/upload/file/kekosimewaterukep.pdfIn PDF document text
    • http://sinoorchids.com/image/file/65187748669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+ballistics+app+androidPDF 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_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 10700 bytes
SHA-256: 19969814a21dfc6ba35c4faec22c5cf5ae505296eb5c5698a63222eb4dccd9a8
font_01_sfnt_off0000fd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD15 18056 bytes
SHA-256: dd78bed346caeb157560947a5361c421c60584bd64b5d9852d94c558b5bad9ee
font_02_sfnt_off00012bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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