Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68a329bd11a4db4…

MALICIOUS

PDF

73.8 KB Created: 2021-02-17 21:16:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a6a1aad30342b7ebeb3a7d6088127feb SHA-1: 31f83533ebc078090358780079b9f49dc49fe887 SHA-256: f68a329bd11a4db4d32c5b319ebd23c503bfa9f311c58e7de55bfc89edd3b70d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document prompts the user to install a browser extension or update, a common social engineering tactic. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://druttle.ru/123?utm_term=cards+against+humanity+family+edition+walmart PDF link annotation
    • https://cdn.sqhk.co/bafesugoguwi/hjijdge/fps_shooter_commando_free_fps_shooting_games_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/kijhgge/top_20_punjabi_ringtone_2020_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/chagjYO/getugofadu.pdfIn PDF document text
    • https://cdn.sqhk.co/pifitudebuxo/qsObuii/nejisitotofububof.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/7392820.pdfIn PDF document text
    • http://gijofabenetawix.66ghz.com/71969699287.pdfIn PDF document text
    • https://cdn.sqhk.co/zapakolozu/igdvuDu/4481997508.pdfIn PDF document text
    • https://cdn.sqhk.co/bupedamarib/igLvGoq/85253591107.pdfIn PDF document text
    • http://widarexidifazi.iblogger.org/angry_whatsapp_status_video.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/jhaiahh/spirit_run_2_temple_zombie_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/oiffihN/33494524275.pdfIn PDF document text
    • https://xugofuli.weebly.com/uploads/1/3/1/0/131070332/913a418aaa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lebasadalo.epizy.com/zupuwevuso.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/43497509873.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/lixudugosoxikatusis.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/examining_the_fossil_record_worksheet.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD419 5420 bytes
SHA-256: 2fd77a49d2f92f96c97903933b1c0c11e9e4c6cc7b998ebf5a0376d761c12b28
font_01_sfnt_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 11216 bytes
SHA-256: a53514a5ef68921cba44f9cec9b3f5e0826fae989fbca6d2e45f62e0c0ba3d8b
font_02_sfnt_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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