Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad42271005a360f…

MALICIOUS

PDF

90.2 KB Created: 2021-09-19 14:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 310f281d9fdffb7ee54ca8266b3a40c0 SHA-1: 2b325d0870c96fd6c75be5f6c5f0e913993ae4a2 SHA-256: cad42271005a360f9e5d96137d8350a579fb3ba7d49aa15bdca497773f3d26f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant heuristic identifying it as a link farm hosted on disposable domains. 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 distribution are indicative of a malicious campaign, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sportuna.be/ckfinder/userfiles/files/39551564602.pdf In PDF document text
    • http://gldbirdgel.com/user_img/files/zosupokotanepemuxu.pdfIn PDF document text
    • http://carywinslowlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wofeto.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/57729739045.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/xugexawugewel.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/43241159809.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/22942887763.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/59609635172.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/kavibukepaniwexenaxer.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/mefifupefajisoxixuson.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/63679431297.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/mukopemusigib.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/69541158068.pdfIn PDF document text
    • http://myslizdrave.com/soubory/ludokerilavaj.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/nasomaw.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/57313650851.pdfIn PDF document text
    • https://aildf.in/userfiles/file/39554530612.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac80e7c3c5---32881943821.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/bosunodoforoderedivexirok.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/68072530541.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/32869870257.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/65855117575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=typhoon+app+for+firestickPDF 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_off0000f987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 18808 bytes
SHA-256: c827f4a87321dfcdd3c29588c1b26ccba0504f5408d703f76e3cd98dabb902e7
font_01_sfnt_off00012ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC5 10700 bytes
SHA-256: a133f739eac65ff75d1802b11750e7419e4cb2038a5bc8db485e2bca9f3abf27
font_02_sfnt_off0001435e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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