Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa72230c4372665…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 03:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a4e63364af624d1cf0f9c69ad000583 SHA-1: dc3d5271d8184b318fc49c9a9b8476f375f56fbf SHA-256: 3aa72230c437266500dd35e31ea541a60712848bf04fc4d3b00661df8ff2391d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_RANDOM_URL_LINK' suggest the document is designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://apskarota.org/userfiles/file/kogimajoj.pdf In PDF document text
    • http://silver.jo/ckfinder/blanc/files/modilaboripefuvuv.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37302678299.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/toloxelajatuzufe.pdfIn PDF document text
    • https://bdata.vn/upload/files/zirur.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/watigugepidevuzenujigiva.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/97837430086.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/vakuvupujujogipipiladupaz.pdfIn PDF document text
    • http://autovoda.ru/upload/files/gifopotadovozerejirupov.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486ea28c7fe---83120105539.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/ronuvizupo.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/momub.pdfIn PDF document text
    • http://esejsc.com/upload/files/16997553871.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/26370762757.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/lavako.pdfIn PDF document text
    • http://iknow.pl/files/file/vomopoga.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/13167983421.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/winabiterinefoxun.pdfIn PDF document text
    • https://www.aillant-sur-tholon.com/ckfinder/userfiles/files/31083022971.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/ponesogotep.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/guwine.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/78566911319.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/78474398451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=structure+of+pitcher+plantPDF 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_off0000ad6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6E 15260 bytes
SHA-256: ca65f4eca6f06f6031ac2e75e17a6dc08f4d778ee5ca9778a18462c8ccb6a064
font_01_sfnt_off0000d3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B9 10584 bytes
SHA-256: 401385055a181f6c954a708083a549251073765ef594650057615d522c2057d2
font_02_sfnt_off0000ebd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1