Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff19e9544727e41b…

MALICIOUS

PDF

76.4 KB Created: 2021-09-20 21:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ea6b166daa613a362cff6330dbf2f4e SHA-1: b7cbd0ba9f5d4d6a6b1313c0d5308f5634ed7d81 SHA-256: ff19e9544727e41bfcad7ddfeecf472873d20bfe5eef055954e9c24031318264
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or phish for credentials. The presence of many unknown URLs further supports this, as they are likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.sherpachristain.org.np/ckfinder/userfiles/files/67616457867.pdf In PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sunawutut.pdfIn PDF document text
    • http://chromoink.com/updates/file/71791693143.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/makunepolijib.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/katusajax.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/67921170560.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/5196433223.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/97343916517.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/40023795382.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/pebojugasemodafavolub.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210914025226.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/44781492126.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/2620302004.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf770e6dd---25730555863.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/61768765394.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/76943344008.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/8047158322.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/takukesodajujojaruwoji.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109081646133709.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/68204439502.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/21884459930.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/42157096174.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/kipuxuwozeforowijizonor.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210920031920.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/161347d624f014---fekegupigujesesenuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=camfrog+pro+apk+downloadPDF 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_off0000c626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 17976 bytes
SHA-256: 96f5bd13c4cac5270e7de51735f6e855504d1bf8db43cc5f2258db83e03c9172
font_02_sfnt_off00010c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C58 10560 bytes
SHA-256: 56881ad96863f569a82719f28de24d36d47be13cb79d6b01e6e2727bc03ba56b