Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa85f333038d5ea…

MALICIOUS

PDF

74.7 KB Created: 2021-02-18 21:01:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9d6fdbac77ccf964baf1d55e4f825521 SHA-1: f12fd6e46070e8ae7d12ebd9865c31b3ba6a708a SHA-256: 7fa85f333038d5ea788e0adbd2fe71818212d8c13d359bd38fe9f7498b31f83b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/aws?utm_term=ap+human+geography+frq+2019+set+1'. Additional embedded URLs were also found, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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 links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/aws?utm_term=ap+human+geography+frq+2019+set+1 In PDF document text
    • http://tibojisitixuno.22web.org/56818509767.pdfIn PDF document text
    • http://zizopeja.22web.org/39036346196.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/izifzwI/aztec_coin_pirates_of_the_caribbean.pdfIn PDF document text
    • https://cdn.sqhk.co/datimemovuko/3HNOXaU/62932178840.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/lake_guntersville_fishing_report_facebook.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408483/normal_5fdeb1348deaf.pdfIn PDF document text
    • https://cdn.sqhk.co/gatidixon/cTYwihs/clumsy_ninja_hack_ios_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/Rbjozjg/balenciaga_bag_strap.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/5HReY5V/btd_battles_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/jj2gdDY/bumujitepirisodikovef.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/mhfighc/background_video_recorder__android.pdfIn PDF document text
    • http://lenudes.com/robot_vs_zombies_game_unlimited_money8qx62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://betelenederope.epizy.com/bewuxegulibidabajomovinu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 5984 bytes
SHA-256: 6fa7b32be6db2235f2e5da8e5d3f9a07cfbf966e6b760ba8cc3aa6b58f7e8318
font_01_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 10400 bytes
SHA-256: 288d493d15b0a90c188d7096fbbefffb6f2d051ab9aa47bbdf52b221845cf925