Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffd7818da0a3398…

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 04:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f6b86c48d480ab74c4bb37d9162d8a3 SHA-1: 078fdbf975421635c260052aae94f9bff9f5261c SHA-256: 4ffd7818da0a3398fe5d6727fcb790587aa721be5bf0ee6c0e52395ec85a66b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The presence of numerous embedded URLs, many pointing to suspicious domains, indicates a likely attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed for malicious purposes, likely to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://fallsplat.se/bildbank/file/panizizojuneziruvavab.pdf In PDF document text
    • http://vnndt.com/Images_upload/files/vitoxugun.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/zokifefavunogowobapomefe.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/20592655589.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/gesevij.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130d371c7e83---79797870595.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/49844155375.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/jugasusip.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/93808891685.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/gudifoxiterev.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/14760346029.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/bebabunakasolidi.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210907_040629.pdfIn PDF document text
    • http://homeopathyhk.com/files/xafuxobekituboxopoguno.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16147dc7755743---4103386659.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/nenaseraxaxegofif.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/3855355174.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/fomezinuzux.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/011811384225.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/debatudexezifuditijipaj.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/duzirapukopekaw.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/woxub.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/64122827454.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/45736745822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=adb+usb+driversPDF 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_off0000d391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 16764 bytes
SHA-256: f1b74a7737458d69967f2062f9ac5016829b4f0df83270552981855e867aff2c
font_02_sfnt_off000116f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F3 9996 bytes
SHA-256: 04df184fb51416200952a9b00120b5683c5df5a4e2bd765809a484f2d844fbd6