Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49cd16e544945d6…

MALICIOUS

PDF

68.2 KB Created: 2021-09-18 07:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23d0034449cf16ca460a693c3590b625 SHA-1: 3c9e06f8ca81a06acb29118192adc820b5d96244 SHA-256: d49cd16e544945d615595218c0188df565f9fa887e44812ed88edb658f98ddc3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The file contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://huntic.ru/uplcv?utm_term=cricket+for+android+free+download PDF link annotation
    • http://chuaphucluong.com/uploads/image/files/1968088827.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/60475576032.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/jopugufatumufesute.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/kogibaxevirinufasofisupib.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091018035373499.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/legelejawom.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210902_996D620A82DE7AA7.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/62310883100.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/1547553071.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/ligigamisogomot.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210903131326.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/69065035920.pdfIn PDF document text
    • https://fuoriscena.eu/file/kosewunekojudawetevafile.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/21839474755.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/23164354962.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/639998827.pdfIn PDF document text
    • http://htwy.com/upload/file/89242400687.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/23477727193.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/65789116090.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/33296751961.pdfIn PDF document text
    • https://tsegypt.com/file/10095962304.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/10860591277.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/lurusurenotel.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_off0000ae1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1F 14788 bytes
SHA-256: a9051c072ae82eb402ed084abd63b8872a7863a28826f6da321b49b88bb570c0
font_01_sfnt_off0000d353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD353 10512 bytes
SHA-256: 62f2f7ca70bad0844eda71443b0ee535a8625df040e2969fbf869e470d1137f4
font_02_sfnt_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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