Malicious PDF — malware analysis report

Static analysis result for SHA-256 fecb63b2f0838fde…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 22:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: cab52ca3606b7e8d8a4300e8876541a3 SHA-1: 6bce5b526464f2b9ea937c5b9e5546386069ac17 SHA-256: fecb63b2f0838fdef510359198960a7901aaa46446573b9ac4287dd99e6ba399
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://palmdale.thepokeluau.com/uploads/files/xapenojepew.pdf In PDF document text
    • http://nandishoverseas.com/UserFiles/File/14520118524.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/foviribenasimavejesin.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/38934788653.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/redunum.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/pekatetogimenose.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210907062519.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/kunoxubara.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210905210144.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/xoruwasufenozelozarozole.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/3414863451.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/17379436536.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/zezopenetetupixodota.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210902201104.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/89481693429.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/nevevadede.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/40445471677.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136be135f216---30487125098.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/92739781606.pdfIn PDF document text
    • https://dacola.com/upload/files/taxiloziz.pdfIn PDF document text
    • https://emmaushuis.org/pages/67226860395.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/40170518874.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/49736353338.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210910112109.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/66958758765.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/potitopegufufopifivodi.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/36241524480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=como+ver+el+futbol+gratis+en+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_off0000e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 18884 bytes
SHA-256: 8bacf47552f7dabd416c5330ac6141f9e5419f3e0bd3bd2fbcea8ca38ad33391
font_01_sfnt_off0001116a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12981 11032 bytes
SHA-256: 32c2deaa0b2ab9be826c5af8cc18e44bf438bff14f0876a2110689dfb03cbe02