Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f9db4630eaf738…

MALICIOUS

PDF

76.5 KB Created: 2021-09-15 22:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 06790f63027f7589515d628ea90e54ef SHA-1: 695b08987c8028a03c5586a27cd37993cbf9835d SHA-256: 22f9db4630eaf738e667c7dec365eda1e5ee4fefa7132a02a99a39d51b740d39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm, suggesting a phishing or redirection scheme. The PDF structure and embedded content are consistent with attempts to obfuscate malicious links and lure users to external sites.

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 http://belean.pl/userfiles/file/50016505826.pdf In PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/vajiga.pdfIn PDF document text
    • http://coumert.com/images/file/jowokosedasukeruwe.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/25450360867.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/dapigolusilatonajubade.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/95200649585.pdfIn PDF document text
    • https://songhongresort.com/img/files/zobevebufigabunebalunuxa.pdfIn PDF document text
    • http://fxlcd.com/upload/file/xubevu.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/xupifi.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/rewibinoj.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/40440129060.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/nupefuvav.pdfIn PDF document text
    • http://intersonik.eu/upload/files/83788881004.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/magibakejidez.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/zovodegonev.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/pezexagomebopedutuzav.pdfIn PDF document text
    • http://mutitar.com/user_img/files/fizosotamowu.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/30324615691.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/zikekixilaku.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/42179305799.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/70179761359.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/dutaxiwefufivos.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/43907855825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=greatest+rate+of+changePDF 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_off0000c621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 10516 bytes
SHA-256: f99df563714b167f2fd6ae1303913371c0154512845480fc5cf7d72d21179410
font_02_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 17916 bytes
SHA-256: 1b71bf25217550843eabe1ba81066d8c8753c95b66fc93d497e703cebe71d103

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