Malicious PDF — malware analysis report

Static analysis result for SHA-256 291e2af9b84748c7…

MALICIOUS

PDF

69.4 KB Created: 2021-02-23 02:48:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: adc85ba98e967e00d245a595a57dea4e SHA-1: 4dcd0f03669b698c9cc0d43f797b847e2cc9d3dc SHA-256: 291e2af9b84748c7221217307c923af4fff6c9752303511c7fa36001db89465d
224 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple high-confidence heuristics, including ML classification and ClamAV detection, indicating malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs users to copy and paste content into a shell, a common technique for executing malicious commands. The presence of numerous links to potentially disposable hosting and redirector infrastructure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • 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/123?utm_term=make+two+lines+parallel+illustrator In PDF document text
    • https://static.s123-cdn-static.com/uploads/4369768/normal_5feb9dafc6dca.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/go2hjbr/touba_hair_braiding_columbia_sc.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/ghLOIr2/biwatiwojimev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450514/normal_601207c247ebb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427828/normal_5fffdaa218d33.pdfIn PDF document text
    • https://cdn.sqhk.co/xewasejeve/FjdQUxp/bababo.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/gtibZia/peace_equalizer_best_settings.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/YEghLuK/basketball_miniclip_apk.pdfIn PDF document text
    • http://denarop.22web.org/ethical_hacking_training_institute_in_kolkata.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489402/normal_5feec8cee8ffc.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://kenasaxoxaxober.rf.gd/chrome_dev_google.pdfIn PDF document text
    • http://petizitopebil.epizy.com/comparative_and_superlative_worksheet_printable.pdfIn PDF document text
    • http://dolumuvi.rf.gd/swept_away_christopher_cross_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/87099139926.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_off0000c1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AB 4856 bytes
SHA-256: 823dc2ee17cbe3d41067f59ceab3d597e59a220116a9a68cbf4f0425341babd1
font_01_sfnt_off0000d253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 11784 bytes
SHA-256: 98d4ae99f8630e353ca4ce98aa596287a4f0a23db6e32cc7600b1681bdb2463e
font_02_sfnt_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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