Malicious PDF — malware analysis report

Static analysis result for SHA-256 263bd76ce4a7e4ca…

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 22:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da38e7793ee8a10d8a0f9049efc416e7 SHA-1: c5a3e0ab2d5d5008f00a5614982d5d6b3d23d103 SHA-256: 263bd76ce4a7e4ca35ac0e73154a51ee593aefb0c6e02d2b00762b2f83635318
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as an MFA/one-time-code harvesting lure, consistent with credential phishing. The document contains numerous external URIs, many of which are linked to disposable hosting and appear to be part of a link farm, suggesting a broad phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://crysiq.ru/uplcv?utm_term=account+hotmail+su+android PDF link annotation
    • http://heaig.org/editor/ckfinder/userfiles/files/95218923510.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/51004099580.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/memojosonolov.pdfIn PDF document text
    • http://geodez.com/pliki/file/16142974649.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/zuzakixixamorizuwixukena.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/ravoziluwakizomedojeme.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/63978244513.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/rolawolonowoj.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/naveko.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/zusazotasiravo.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/xomukoxupilikonubirutiwuf.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/25236804679.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa07ecbfc---rugik.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/faduxojotorojilogosaki.pdfIn PDF document text
    • http://vit-physio.de/file/paxetebugewoxitigiziki.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/dalafezokixi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613680c037c10---24693517829.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/95178849790.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/71532791534.pdfIn PDF document text
    • http://geoman.cz/data/file/63654161736.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/roburigefisewobixo.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/mizazagalax.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_off0000e8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 17700 bytes
SHA-256: 40b28c7e9c41169de3a3bde95c2fa7c60065f3961b8a07d01a4358693f118f40
font_01_sfnt_off0001169d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169D 10584 bytes
SHA-256: fb25d9d56012e9d6b26210a4715f9e0161f1b5389b14db891c0d3e388ce729fa
font_02_sfnt_off00012e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.