Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bf1efd32c595b5…

MALICIOUS

PDF

87.9 KB Created: 2021-10-08 09:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c687e8a0832f2c9e7515aa8df5c5ba85 SHA-1: 1928bdb1857c25c30d9e1b0b843a6b89c3763fc7 SHA-256: 52bf1efd32c595b50c84b7d10f7ec931d7909ee861ae50c6e84ac17291673cbb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document for its use of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the embedded URLs and the detection results strongly suggest a malicious document designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://abwrosedale.com/uploads/files/zoxefodunusumetoj.pdf In PDF document text
    • https://hamzakocakoglu.com/userfiles/file/nigejora.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/34884500781.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20211002020846.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/38088487288.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/1090587137.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/00e84ea17deaa4d978294a1bbc6d59d1/21494592453.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/bemenokowivu.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/5337197056.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///pulad.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/magitutigalovavisikizaju.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/xerazoguroponunisegunupa.pdfIn PDF document text
    • http://salonrowerowy.com/userfiles/file/rufisebuxejenebazijuv.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/50832691003.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/6551560814.pdfIn PDF document text
    • https://curvy.tw/upload/files/31797711298.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/84890297167.pdfIn PDF document text
    • https://wasael.com/userfiles/file/kalivavadadojebuno.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/77428494010.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/29900314538.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/kefubepemomerugonewob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ben+smith+rugbyPDF 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_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 10632 bytes
SHA-256: c9d866b7e340fbdb6a39d8971c9d134df9ea9319b37ca5abd1581ffa2bfb6413
font_01_sfnt_off00010628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 19932 bytes
SHA-256: 1eaab702d2c2bcc3d28740402e27514719228162c89d2ffd5e1c31fe4e17feaa
font_02_sfnt_off00013a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1