Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8115ecb1205d975…

MALICIOUS

PDF

77.5 KB Created: 2021-09-24 01:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20c6dab8485f3818e2f117384379c509 SHA-1: 20cab38fa01d9fd52502c898d06ff1824ff6019a SHA-256: c8115ecb1205d975a1dbf4754e25c4c7cc456076fac9ba140d2f259db0353733
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a likely attempt to redirect users to malicious sites. The PDF structure and numerous links suggest it's part of a larger phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://getampedmag.com/ckfinder/userfiles/files/xoxixewixixojojuwuzi.pdf In PDF document text
    • http://5m-tti.com/uploads/image/files/pavipabelumem.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/rifebozugibosenomakimega.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/16135967664.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/10943452026.pdfIn PDF document text
    • http://scpt.it/userfiles/files/97898153827.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/wuzagabetazuzagowuromepe.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/238206695.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/fuboligasaxafativate.pdfIn PDF document text
    • https://trexanh.net/upload/files/tirovof.pdfIn PDF document text
    • http://talesma.com/E/file/59405695302.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/23380480766.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/54113531052.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210902_7DA73AE098425BEF.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/kixusariledosupamulekejab.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/dapaguziwusutuxoluki.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e85e12e972d314e260937a179b2fc1f4/wakunuso.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/24024615678.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/95312227954.pdfIn PDF document text
    • http://mamitobe.ru/files/file/kezugowujovol.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/lanedexuruzexepabelu.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613744ab5900c---lezixaraf.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/59224485543.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109051131314309.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/26574478498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+delete+your+google+search+history+on+androidPDF 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_off0000cb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB17 17016 bytes
SHA-256: 5655d08b2fe8574a8e79f58267e4375656f6e6d9983cf45aa35235624e069057
font_01_sfnt_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1E 10940 bytes
SHA-256: ec2c114e3773129f629e837add0c6ccaa2715928aabf8df13ded6467e9894452