Malicious PDF — malware analysis report

Static analysis result for SHA-256 48664b14e29887ff…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 06:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2827946b9a42b10cfa3a26e3eeefa118 SHA-1: 71f394bd75dfb62a593f51d411a1a52e76c97167 SHA-256: 48664b14e29887ff6721da1a6fce3a83f1366e58c4f7b4ce37b8161a16d6775d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics indicate the PDF acts as a link farm, directing users to multiple distinct hosts, with a high number of links per host. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133b39c8c39b---xalezibe.pdf In PDF document text
    • http://hanasushichoice.com/uploads/files/22405701332.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/tijiwenen.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210912122323.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/potafoxibidutuwupotider.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210908195117.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/sodibiniwixadozul.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/65822224428.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/jemowijikureji.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/mowivexunidenobogapuv.pdfIn PDF document text
    • https://kaparatt.com/images/File/liforivefenatu.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090400102473499.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/nezebuzusifekosofejowudat.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/mifavirizidoteruxifex.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/61608195377.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/seraxadiwizumaveziwe.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/popovepigujobis.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/wilomosikegegasisurinar.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/8975241805.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/9692217612.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/mudujudegaduzuve.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/75313829116.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/bajuzuzinufejaxomiwo.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/pufewuvoveratikawuzadevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=3d+driving+class+unlimited+moneyPDF 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_off0000d156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD156 11068 bytes
SHA-256: c1313f19b10b167c219cd0c0f430ef7cc110a07a90206d4fcceda80eff48b126
font_01_sfnt_off0000eaf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 17616 bytes
SHA-256: 9a6368c3e84f799ddce615095c96da37222ee91c1023ffb8e71c98403f53d9eb
font_02_sfnt_off000118cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1