Malicious PDF — malware analysis report

Static analysis result for SHA-256 84300d5df041599c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-24 12:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3592ca846a00fb13df0ecf9ea1870d47 SHA-1: 494d771eeba41a1d52f43791e74f318cc906daf7 SHA-256: 84300d5df041599ce96f4d03bbb6caaebb2f74f4c94f1ec3450233b44057b6cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous links to potentially disposable domains, suggesting an attempt to redirect users to malicious sites. The document body is unreadable, but the presence of many external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/86166169698.pdf In PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/vagivujasuxubosetilebobiz.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/60024418662.pdfIn PDF document text
    • http://etre-belle.su/images/file/78409225216.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/66395298691.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/52443201018.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/867cfbd04b598a7f177b1036f7810832/3401719481.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210916_E4EF596D2F2444D8.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/diwilak.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/fobaxitir.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/megexikaxeb.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/95304440023.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/85462611282.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/9966518414.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/56806437831.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/dalevaginikonamak.pdfIn PDF document text
    • http://ranchobg.com/img/file/vibexunuzojixesenu.pdfIn PDF document text
    • https://granitnet.hu/editor_up/94856248549.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/21389334052.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/lotelukoz.pdfIn PDF document text
    • http://rcot.by/pics/files/10318799617.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/gupowetezufikufibiwilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=redmi+9+prime+miui+12PDF 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_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 10340 bytes
SHA-256: 35891b92e273170adb6255bff3bae8f97c8cca70bbb5b50dcc2b283fe44d21bc
font_01_sfnt_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 17496 bytes
SHA-256: c5bb319ed209a1540ca587da50061cacc5a157f9e9ec13cb992245207ec881b5
font_02_sfnt_off00011ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1