Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05525bc24108e65…

MALICIOUS

PDF

76.6 KB Created: 2021-09-16 02:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3e5a2c68c7b4c7edcd354ed50a88ef61 SHA-1: 2db84579661040a975093b22eda0874789b394b4 SHA-256: a05525bc24108e65e474d6efc837f6fb027bd2d4fddb7d9d0d5ddac26a90bc67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://smidgel.ru/uplcv?utm_term=install+messenger+free PDF link annotation
    • http://teedinmaesai.com/user_img/file/24497602292.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/24767854287.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/64693109153.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/84341487933.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/mevogudobemuzunemagidika.pdfIn PDF document text
    • http://bibikid.ru/upload/34230349255.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139a9b3cd849---koliwulotidedofofurimosom.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/52347698334.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/gurorutimoj.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140b91928582---wemonuzizevovipilamozu.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/wasutimodekezedotani.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210903_085228.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/bonem.pdfIn PDF document text
    • http://bubb.cn/up_file/file/8356783559.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/vosofutojanok.pdfIn PDF document text
    • http://kant21.com/userData/board/file/32256212442.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/dixewukejo.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613c719b3447b.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/tikuxujejezi.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/jomavojukirenofukal.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/wusivi.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/motofetajagujekarej.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/gerepajesoruzejevosexovi.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/7244819187.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/41134305148.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_off0000c891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 17404 bytes
SHA-256: ab23827ca73207e7a260345dc305024a263391a4cd90f554b85ad78eb167e8ac
font_01_sfnt_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 10296 bytes
SHA-256: 8a70bd8d4b83b887cda8ab21638593b1272f54b1399c75e75997b8a9c516bcab
font_02_sfnt_off00010cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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