Malicious PDF — malware analysis report

Static analysis result for SHA-256 412d3dd8d78db564…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 02:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5728ce85fab846e0595ac118b29ebad6 SHA-1: 45520dacd79826427ade2f9a00af9de4c2316873 SHA-256: 412d3dd8d78db564f93d5f4f467e726618da2db98f1cb24d8930e0b67d0618b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=uefa+euro+2020+free+live+stream PDF link annotation
    • http://tgroupsrl.com/userfiles/files/92490766998.pdfIn PDF document text
    • https://denimder.org/resimler/files/91033335081.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/73789579660.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/2193397908.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/noropa.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/tegatati.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/wejovabokel.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/kesegibebozuripisutu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614727ce51290---bipovabituvixebemureranu.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c08367bd92cd2868b27d09d614b001ee/76809254554.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109010138427093.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/92552892068.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/veroxerijopovegagofefibak.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/82409100897.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/20317815939.pdfIn PDF document text
    • http://tulga.ru/editor/files/45198344194.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e50791ccf1---getonozenexonenigodebumo.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/65151361406.pdfIn PDF document text
    • http://elsped.hu/files/file/dajikatobepuvuwagawib.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/doxipulolotogikuruwiz.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/62798318385.pdfIn PDF document text
    • http://sun-tes.ru/files/file/94781552621.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/dofetemaludazezetoko.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_off0000ae1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62F 14904 bytes
SHA-256: b9bd66f59c4ca85a6cc5358aeb3353257ff2a0dcbe5989e60a38d6c1110ba44c
font_02_sfnt_off0000eb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 10684 bytes
SHA-256: 48629355275880d231a8241a942a82e65c92bc15b0d12cdd15bbee678a50d747

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