Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d38df9d867d1308…

MALICIOUS

PDF

70.4 KB Created: 2021-09-30 23:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ae21f561325377806db67a5fbf52c364 SHA-1: ef6e63206880ee5b58608fcd4ea4e9d0424f8e31 SHA-256: 4d38df9d867d13081056387cbb7c3b88d7c88273133b9f338d668b92fad0854d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://2222.netsociality.com/upload/files/rabukezi.pdf In PDF document text
    • http://speckletrack.com/update/editor/file/63094556576.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/vupufegodeb.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/60469972784.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140ed42d8b1c---nelebibusejuresexujotimi.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109090431543541.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/56477488666.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/jaxiruzez.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/97186292600.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/45916035031.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/cb3d3522300b3af39c1192d6c2ef3176/3784174619.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/vigimowefusewifatedotu.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-17/20210917025731650453.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/segus.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210906101955_aaps2o.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/71679717436.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/tewugow.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/nimeg.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/pikevenifedegosozisa.pdfIn PDF document text
    • http://hkalc.com/userfiles/domobix.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/4103765232.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/resuferujatuvatapezivuxa.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/3030809265.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/zovofevugedipawaxug.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/jopiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=resident+evil+4+android+apk+portuguesPDF 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_off0000b0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EF 10948 bytes
SHA-256: 6485809fb85b1044bdabd5ba71170f462f96824694402e16141e5d5c11d443b1
font_01_sfnt_off0000ca4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4A 15604 bytes
SHA-256: bb57919e12ba4ace8986ed09b2c08a5e44cc773f49b2f7a9b7f3a1b258d08264
font_02_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1