Malicious PDF — malware analysis report

Static analysis result for SHA-256 580a7ea25ac9b075…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 11:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 99a65c1f706cada945f87fad183c827f SHA-1: c9268a4e5383a35d1bf1b89b81641f54bdf3fb2a SHA-256: 580a7ea25ac9b075e501209549c862d676e9c5e819b19d92bfe393616009e2e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded URLs, with one specifically linking to a purported free download of NBA 2K20. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for such links, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials.

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 https://garglob.ru/uplcv?utm_term=free+download+nba2k20+apk PDF link annotation
    • http://infinity-pro.ru/userfiles/file/pakelegadagato.pdfIn PDF document text
    • http://brukbet.com/user_images/file/81753046401.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/61475210124.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/97856300836.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/21376077948.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/samumezubipudobote.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161371a11178d9---tefaligutebujew.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/51644406301.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/wovibamezadin.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/68572634007.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/23847931834.pdfIn PDF document text
    • https://pindimana.in/uploads/file/96077829039.pdfIn PDF document text
    • http://bubb.cn/up_file/file/6324402832.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/xubut.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/75219430273.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/mujoj.pdfIn PDF document text
    • http://tzsunup.com/upload/61263920241.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090945518_120664922.pdfIn PDF document text
    • https://cowik.pl/upload/gogugunesuwu.pdfIn PDF document text
    • http://www.perlodrink.com/documents/87787007346.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_off0000aec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D8 17468 bytes
SHA-256: 5477a98f2ed1f25171b6c6e38673a840277653859c0ca69b24f48e1ee8fbdf60
font_02_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 10564 bytes
SHA-256: 0302ea49043a1ba01c38fdf01cd92765b32cddd175ee8a524b035bde17b86712

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