Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57b9dffcc3e415c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 02:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54e93b73bd4034ef08281cf445f13970 SHA-1: c1b1916ec9f8fb7b94ed95e09601e9a0f8708ff8 SHA-256: b57b9dffcc3e415cd3a0574f8582d31ddbc6c94f07ad82a12c9f46e2cb888308
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs indicate it is likely designed to lure users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://srcchaika.ru/files/uploads/files/sijuber.pdf In PDF document text
    • http://nanoscopy.ru/uploads/files/jilira.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/46714681383.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/79395113015.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/62177119235.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/15072525520.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/zexodinuzajojegiroda.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/xafuxevobonawap.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/sefesupinim.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/xonewako.pdfIn PDF document text
    • https://invision.buzyhub.com/files/4854954926.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631737437.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/renirom.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/84630105211.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/vfttefj28c14dhvgecei9g9m47/66364797288.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/komodeme.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebc8d1acd---63442004650.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/jeturom.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/84154868119.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/61297322290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=privacy+app+for+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_off0000d5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 17140 bytes
SHA-256: f45bb7268f7194e83e8a63678264385caa1ecfc11bbb6ff37891386c0ea53887
font_02_sfnt_off00011a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 10352 bytes
SHA-256: 3c5e984a0b1bd55850397065bbaa953378a5967f154147053a57d44b2098f111

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