Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc23179e35bd8fb6…

MALICIOUS

PDF

159.4 KB Created: 2021-10-04 15:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 76648d22fbb47ad8b97b4a8af59e5f20 SHA-1: 0f4b7af4b6d44bb6ba9ecedd9f4e5580cafb8a80 SHA-256: fc23179e35bd8fb63333f9792140b6087749f256464a75114f28f3ad7897ba64
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, and numerous unknown URLs were extracted, suggesting a phishing or redirection attempt. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly support the malicious classification.

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://bdblue.com/ckfinder/userfiles/files/19118640352.pdf In PDF document text
    • http://bolt.fo/public_html/userfiles/files/40506196540.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/68577814069.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210902015840.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/gawalakikorejimemoxupowa.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/sigekafasotajebawegavato.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/wunamu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161519405a1c5f---84708751289.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/39865239135.pdfIn PDF document text
    • https://slavyansk.biz/userfiles/file/76055812547.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/73087652163.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/89241061850.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/xuragivubipufavap.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/gilonozupineviloj.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/44427735190.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/2293766613.pdfIn PDF document text
    • http://offerparts.com/upload/files/96578455496.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/sijirofo.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/20407467964.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/54507891230.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/74646611798.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf12ee16c---wiwatudo.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/15903200275.pdfIn PDF document text
    • http://hbaoge.com/upload/files/jofituk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=suite+life+of+zack+and+cody+episode+1PDF 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_off00020146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20146 11008 bytes
SHA-256: a8dee4d4eba87b52094395ad0cfb76a9cebe80d2fe76050c862e98f125e4efec
font_01_sfnt_off00021b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B17 23568 bytes
SHA-256: 902f3b21eb3032ad13726e98bf652d222f8a173c8b3948b0511195f11d90715c
font_02_sfnt_off0002575e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2575E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1