Malicious PDF — malware analysis report

Static analysis result for SHA-256 965f99fdd5edb5f9…

MALICIOUS

PDF

73.6 KB Created: 2021-09-13 07:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 879b0f7b02b68a1849df9ccbf852938b SHA-1: e8b9593c5c5ff72adc28b6b23284895472aeec44 SHA-256: 965f99fdd5edb5f9a7d6abc7e3ab13e37d9cca99c3fa5aff8f8db8fe6cdeb857
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to potentially malicious domains, suggests it's designed to redirect users to phishing sites or download further malicious content. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates suspicious command-like sequences within the document text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://onlineadda.organicemall.com/ckfinder/userfiles/files/95658115881.pdf In PDF document text
    • https://rwd.webseo.tw/upload/files/terujuteje.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/buluzewidoju.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/wezaruloxutu.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/24637893952.pdfIn PDF document text
    • https://terracell.pt/images/file/pofap.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/sutudi.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16138accabb77d---luxovujeguzazede.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/2964799490.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e86ccbe2ec---55108067343.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/65893659827.pdfIn PDF document text
    • http://laduses.nl/image/file/52802704007.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/xebabepifaj.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/74489506428.pdfIn PDF document text
    • https://badoza.net/userfiles/file/48515973869.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/56637814328.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/dagetonapedejawika.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/rusijajajezivuvomiwumi.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/mozofuliduzanukalumikik.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/76147503532.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/97918860190.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/vososifatawuwusatupepil.pdfIn macro / runtime command snippet
    • https://zoomkish.com/basefile/zoomkishcom/files/tubalogozivixenarow.pdfIn PDF document text
    • http://grafitym.kz/files/file/zefujarexuxesugomuvik.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/takowidezenunesenetop.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/75522829083.pdfIn PDF document text
    • http://portaldo.eu/contIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=keepvid+app+for+android+free+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_off0000bd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2D 16824 bytes
SHA-256: 52f88e8eda2c7dac5dce2e74ae8ec8c1443d08383cd1d72c63dc721dba4b00d3
font_01_sfnt_off0000e854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE854 10368 bytes
SHA-256: c554296e768204b0724c9f91c75cd20c2ca05b9e89cf881d752d771874e1fe5c
font_02_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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