Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85a2deef0d49530…

MALICIOUS

PDF

90.7 KB Created: 2021-09-24 11:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fcc79adebf2043caf0f38ce09101bec6 SHA-1: 42693ff3652ad34eb022eb632776ae5df1afdaab SHA-256: f85a2deef0d4953072877bfe5c3ebddd43612f86824cef951f85bac5726203ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URIs were extracted, suggesting the PDF acts as a lure to phishing or malicious websites. The presence of embedded URLs and the PDF structure point towards a phishing attack vector, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://chcial.ru/uplcv?utm_term=you+%26+me+film PDF link annotation
    • https://cissud.it/uploads/ck_editor/files/zosadokezapagavojazo.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109182104111330.pdfIn PDF document text
    • https://ms01bet.net/contents/files/38328762948.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109091908212196.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/gutixawunuzer.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/36121952156.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/22437241056.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/rubaf.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/rivawuwigoguram.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/gopubarukijijakowafeba.pdfIn PDF document text
    • http://ndt-ultratech.com/files/20698909210.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/46094518243.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ec36caa409---2826188644.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/danogizu.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/dcf38766e9c1a70ebf456ff43a3bac9e/zelenonev.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/fusokosaruwovukexit.pdfIn PDF document text
    • http://ibb-online.ru/f/file/pudogotek.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/45495046337.pdfIn PDF document text
    • http://stringladies.cz/userfiles/39316276232.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/98636262311.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/wapikukat.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/zubuloro.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/43423355484.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/sosim.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_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 18912 bytes
SHA-256: f24a0a832fa7d30b3b76f88ef32b97654e02290475430019d57465f22089be64
font_01_sfnt_off00013261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A77 9276 bytes
SHA-256: 31cb0845ee87de8bffa14f85118d5752b7d25b1e08901a4073ccdb06f765b235

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