Malicious PDF — malware analysis report

Static analysis result for SHA-256 d175fa00437b6cc3…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 16:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 43a9b161788a8d56452160fe82d5ae70 SHA-1: 6634c17123a9c31e7788dc71fde5df1810a92b25 SHA-256: d175fa00437b6cc399401a6e922188b42796f59fdfe485d3135954c8c8ceeb3e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many unknown-reputation URLs indicate a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://medvor.ru/uplcv?utm_term=max+payne+2+download+apk PDF link annotation
    • http://erh-hu.com/userfiles/file/5842913069.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f7727c764---41734196598.pdfIn PDF document text
    • https://alpinashop.bg/files/9024699566.pdfIn PDF document text
    • https://rafautama.com/uploads/file/felulazidezerasanifusi.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109110722386163.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/naxugikekipomumeduwijij.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/duwosemekevaboxij.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/8437502925.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/wajumupigelofutomegi.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/90951795530.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/0485794b39e29cea3d8d866d1e833bee/1028967796.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/vemesuvogusazupeze.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/47098307442.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/bufusebosirevefopawoju.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/godedufefakab.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/pijokanupedil.pdfIn PDF document text
    • http://sinners-party.de/media/file/zedebodaduripobisosul.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/09/file/20210909_153333_141.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/53485646341.pdfIn PDF document text
    • http://serting.eu/userfiles/files/57943108146.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210903/file/koduwise.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/11450935653.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/3167656791.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/11979411535.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/zoruponokemijowuru.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_off0000df09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF09 10432 bytes
SHA-256: f0657e2cae94e832fe81647887959714384c5b161d10561bead6cee77b64b151
font_01_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 18276 bytes
SHA-256: c143faa056d8aa4b968484959c9a766dc0b5782755ffde5be8f3ad7c06d99b14
font_02_sfnt_off00012682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1