Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d96b48ede7e2fc…

MALICIOUS

PDF

67.9 KB Created: 2021-02-25 12:24:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b2fbf3709598507d34beef572f3621e5 SHA-1: 9a2b10b37a80c5ce010e4a63791c8081b5c84eb8 SHA-256: 21d96b48ede7e2fc3d2948c9c74f8dcf45c871d104eae2db208790933eb8f9e2
154 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. The primary malicious URL, 'https://yafferge.ru/strik?utm_term=insinkerator+excel+parts+list', is identified as a redirector. The document body, though heavily obfuscated, suggests a lure related to an 'Insinkerator excel parts list' to entice users to click the malicious link. No scripts were extracted, but the presence of malicious links and high heuristic scores indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/strik?utm_term=insinkerator+excel+parts+list In PDF document text
    • https://cdn.sqhk.co/vatomepipiw/hjCaZIY/34040620207.pdfIn PDF document text
    • http://uablog.website/khloe_kardashian_instagram_picturesipc9q.pdfIn PDF document text
    • https://cdn.sqhk.co/fafovewidom/gcWgfLY/electric_screen_for_prank_live_wallpaper_launcher.pdfIn PDF document text
    • https://cdn.sqhk.co/fafovewidom/ZAXhdjf/4039914596.pdfIn PDF document text
    • https://cdn.sqhk.co/buzulexoxuve/pjbujgS/bubble_cats_rescue_switch_review.pdfIn PDF document text
    • http://soul-felt.com/dalovobimev85.pdfIn PDF document text
    • http://50offshop.pro/77356561803qee49.pdfIn PDF document text
    • http://xplaintome.ru/dovebowusawekip02ng8.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/0v83ger/candy_cane_lane_movie_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mojabumenir.epizy.com/vabaresubimokefabunuwatas.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/beading_books_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/67474781446.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/yahoo_mail_pictures.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_off0000ca21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA21 4996 bytes
SHA-256: 00d2558eef760222ede5974ca3a4bbc9a718f600a1f958c2123c6bf1d50a5bac
font_01_sfnt_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 12140 bytes
SHA-256: 7ddc15d38d2e96333ddce5063419ce69fb8b8813383096fa935fa67759459e98

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