Malicious PDF — malware analysis report

Static analysis result for SHA-256 6520caf08302b6b2…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 12:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23838ac23a7e2dccef1399323227c2ec SHA-1: ca7212dbe62cde5d59fe9b0b4ad35c04d9083ebe SHA-256: 6520caf08302b6b2598a38279247ea351a127106eca436357a2fc121183d9b0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, indicating a likely attempt to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wu-pao.com/upfiles/editor/files/xitikeruvuzizar.pdf In PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/nuduvivanizadozixade.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/91809372502.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/74684659764.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/nodin.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/zikupekimaxigitiwadali.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/wepatedenikidifetowiror.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/89695695386.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af32ea991d---10682823626.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/72651826785.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109061252407483.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f3d34e3ca---30213174155.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/mulikizokased.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/lenadurib.pdfIn PDF document text
    • http://dkind.net/userData/board/file/10431933806.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/xixan.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/gixafafetizumusuxu.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/29821385985.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090805023273499.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/84445047338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=csr2+hack+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_off0000d486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD486 10436 bytes
SHA-256: e91bed16e037b7b6a9654b545d5bc0b37363b3a054daaad4ee450adb0b846556
font_01_sfnt_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 17420 bytes
SHA-256: ac8b9ab763ca5658bcf712cee013c0f6a664099e1f75a77393f7c67a3ddf2a49

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