Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76c6c3211ac2e6d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-22 18:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ee902c2891ee52fc29466453731a579 SHA-1: 6e088bc508a09cd7f6ae5029fde4d96a4fab6d94 SHA-256: e76c6c3211ac2e6d25155895283e032500308273e714da7a875c5733ea843f60
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URLs, with many pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution suggest a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=artist+famous+for+splattering+paint PDF link annotation
    • http://heryeryesil.com/resimlerfiles/61814474752.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/75291572235.pdfIn PDF document text
    • https://brukspec.pl/upload/file/tasiroguvowapajuf.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376383ddc47---92110721907.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/1955449544.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/sijagezivadodemok.pdfIn PDF document text
    • http://p-energo.ru/content/file/gebinulebomuroted.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/93705098388.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/nemuvupexexifibewebog.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/lafutazojuxijiwekodura.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/67423805340.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/9283030295.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/zerepijaxukila.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/68157631863.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/nirifaginisidet.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/favenupegiv.pdfIn PDF document text
    • https://ms01bet.net/contents/files/39622400781.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/fogoberidabegabusafoguzut.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/70coifvdnjl0maraj188l443d4/sosowogev.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/zovimogotajo.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/wamekuzutef.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/20770991525.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_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 18144 bytes
SHA-256: 8d1dd7fa82440181e0ae702d400a7a2b4b21dc2fc736628c531475b18f07a9c9
font_01_sfnt_off00010765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 10780 bytes
SHA-256: 2aa260bc4b6b5f7447704f2bcc40e7e2bea8ea837420ecd6c27b89000574c736
font_02_sfnt_off00012042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1