Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0799f3bc2bc4593…

MALICIOUS

PDF

92.5 KB Created: 2021-10-07 00:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 626f15588c8ab8c92843d5b24f0a2ea9 SHA-1: 2de950d431585e08dc665f4a8de141b0d90125ef SHA-256: d0799f3bc2bc4593f0dd5eccc0420ec2e7936bb2caf2f54371b9c13fe0461813
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=one+day+shootouts PDF link annotation
    • https://peterdegendt.be/file/33475561964.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/womijujemixa.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109071655027575.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/tamunedapimo.pdfIn PDF document text
    • http://z500.si/files/9169738649.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/94876111026.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/naronisivurugageba.pdfIn PDF document text
    • http://divelife.kz/files/file/jufavosasujevafikiti.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/binifume.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/96312756803.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/libigitegopikigawufema.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/37868536408.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/8927588000.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/dukatasadukupo.pdfIn PDF document text
    • https://fong-cai.com/upload/files/likutubitubalusir.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/bosobapejur.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/nupipubuguzar.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/rumawudejovu.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/43461927953.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/wutujalegivuxisuzonodaxid.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/jogarafezuromegovibuke.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/pojurazupod.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/zukapumom.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/dadalotubetikolok.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/gonugurubumotoronub.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/49726693071.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/nikupisenugi.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_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 18144 bytes
SHA-256: 6f86da6c18de1509386eef8e602c6075726e79a8845178885705b98b6db6f800
font_01_sfnt_off000134b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B7 10344 bytes
SHA-256: 1deeec5c94baa0828e9448644176e6d14d524a54129a5de08b4f795a01c7ea4b
font_02_sfnt_off00014c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1