Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5e5d12b7e8c08a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-24 07:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 772d65bc178acaf27ac90ab4d26fd33d SHA-1: 8315c7f7715a1141740ce540cb16e4d87c77ee21 SHA-256: ae5e5d12b7e8c08a7c0bdafd15dfb25612d39ec5fbaadd8b49f1f896e86546c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://onroerendgoedindex.nl/images/uploads/19449003142.pdf In PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/tobaxajujerojasud.pdfIn PDF document text
    • http://donghotam.com/luutru/files/2006069984.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/95289584435.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/64873067571.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/benojapuxomoxoxuxakor.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/vigujewodiriporo.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/7340504358.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/zifosisowowanowi.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/sitesofirugupudapim.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/jarelibifibunegobidogus.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/kigaxarobogujojolanarok.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/67313500846.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/12223615315.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210918202503686041.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/pororamevazonoroka.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/10259074266.pdfIn PDF document text
    • https://uangraja.com/contents/files/76357485306.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/57289426054.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-10/20210910213116641152.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ps0kpdnhfv19hgl807doeuv6tq/wodaxapudubibabonupagen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=death+race+game+downloadPDF 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/mmIn 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_off0000e75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75F 18200 bytes
SHA-256: d2a1fb6604d07143c8d4e005e5994297e7b79f2bbcdef501d53b940e5e690202
font_01_sfnt_off0001168c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168C 10644 bytes
SHA-256: 29b4b57b8adc0140e74a873b9f4220870eccae858a529c2f4a5bc1d04b6c89a4
font_02_sfnt_off00012ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1