Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc2d2b2e0b6c520…

MALICIOUS

PDF

74.4 KB Created: 2021-09-17 12:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01f6e92a274046cc96c8631ec0c5fd65 SHA-1: f55a18d9564b2f6e38f8a187dffb381e258f42f6 SHA-256: 3dc2d2b2e0b6c52072dd47fbd101b43c790c0985b859f4026d733fb38c95d542
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://ketchas.ru/uplcv?utm_term=is+61+a+prime+or+composite+number PDF link annotation
    • http://backkwang.com/userData/board/file/ropadimomuzosul.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/liguxiwap.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/17562733043.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/zepaverupago.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/11770410388.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/64961651537.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/83143418024.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/95643907203.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/68862958048.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/rodobaxanusofisi.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/jemudetubutexonilegoki.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37618026161.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/kotifowejafi.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///202194224549458.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/39197812284.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/vafokatutod.pdfIn PDF document text
    • http://ailizia.com/userfiles/sefebilaz.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/magudokujoj.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/luviguzaxezawetolupole.pdfIn PDF document text
    • http://runhouchem.com/upload/files/fajogozodukopafaguwowuve.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/49159886674.pdfIn PDF document text
    • http://synphabase.ch/upload/file/susiremopezep.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8339c6765---11170714882.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_off0000be74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD686 17196 bytes
SHA-256: 69c82653e9044f04161d41b3f512769d166ae07b12652323458b5b7b9d99dd50
font_02_sfnt_off000102dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 10900 bytes
SHA-256: 989f44203d5098ef89a870ec111b91dc3d0e2bc7eb1722628c62155c209561cc

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