Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8a8a2a52941153…

MALICIOUS

PDF

155.8 KB Created: 2021-10-04 16:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: abfadaa8e2821223a95c701e8e7bdf27 SHA-1: e43b049aa9ca51640e579762f905b1f8807a2415 SHA-256: 6c8a8a2a5294115385cff2c15c82974598a593f15d11f6ce00e72db180de9561
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/uplcv?utm_term=my+time+at+portia+assembly+station+not+working PDF link annotation
    • http://aal.tw/uploads/htmlupload/files/81620212630.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/eb5b6bf788df630e04f010e92cbe1df4/nezewizukapupeliwoxebezi.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/91691828298.pdfIn PDF document text
    • http://thaifilmind.com/upload/files/zoguloge.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/kubupegig.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/nutuvujoxakepa.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/62625953323.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210916062945.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210919071504904.pdfIn PDF document text
    • http://vaynhe.com/upload/files/nezomizezetubu.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94244377549.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/kesavu.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/xosojewuvadexafo.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/potizuvagazakasapigemed.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/wesakenudubujatutuj.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109260547408802.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/34281184879.pdfIn PDF document text
    • http://www.520amis.com/upload/files/93313959848.pdfIn PDF document text
    • http://lamay.de/userfiles/file/fopesujifobejabaned.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/920866896.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/974874288.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/muakjlfoejf9jalhf5gi1ivf9j/nixunapejepuji.pdfIn PDF document text
    • https://rjpexport.com/files/fafezobifiz.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/jaxobowaxikavelagese.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/xexutumupejotowerago.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_off0001f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F75C 20720 bytes
SHA-256: f8cd781b93d1bf23c657226556cadea75af930151b2c55ad9522fb48044dc322
font_01_sfnt_off00022d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D69 11020 bytes
SHA-256: c62626eed0523afdeb9f83233a2359e4935036480b19a9d87ab3b5f21bd310e5
font_02_sfnt_off000246e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x246E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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