Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a3da9fa3eb7587…

MALICIOUS

PDF

77.4 KB Created: 2021-09-18 23:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5ab3ae94c23132bb2bf7e36e8ace5ac5 SHA-1: abb3fd6f49e2978a466eeacd556f24d46c60525e SHA-256: b2a3da9fa3eb7587a426039e8ec0e17dc0923d522d9509b36869fe1000df4027
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to host PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

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://luxe-pools.fr/i/File/39062980204.pdf In PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/jesorarinosaretu.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///61791743005.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/11476601908.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/senutukawuvikiniseguxola.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/1730827214.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/lebemetoku.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/pagepojewepusixig.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/gikewolutoxawixeworom.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/6178928572.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/8306080972.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/56107308961.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/18464206521.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/10836612970.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/78017594872.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/61166932722.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/jivokalawowatamevapen.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/xubedatubikumadugewugiwip.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/padukipukotuwonisukipu.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/bubagevitugiki.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/posoxi.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/44555333643.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/xekuminu.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/rujujobejipipabi.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/dutolokimasedes.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/98977401728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gom+player+pro+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37D 10196 bytes
SHA-256: c9df5767d1d79ed5862bdff7420ab243ee7cc0950d8f12e3b18ec9cbd1a6a0b9
font_01_sfnt_off0000ca65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA65 15592 bytes
SHA-256: cf9285798567c2de0ccf21671f9ebc823901562513763c1e8508415384d26bb7
font_02_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A14 18720 bytes
SHA-256: d56022cd57a680110301f50673fbc8942a73e6c7b867472d8b6dc2b235932ad5