Malicious PDF — malware analysis report

Static analysis result for SHA-256 4715aa199118faeb…

MALICIOUS

PDF

76.4 KB Created: 2021-03-02 02:04:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dd648c980ac1598c4ed88390e54a34c7 SHA-1: 27e1a039fbf325e77a8c38b67fba39b4ea02ad4c SHA-256: 4715aa199118faeb5c688cd3912c198c814bbb533a2004875d4340ae970a0e53
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically. The presence of numerous external URLs, some of which are associated with potentially malicious content, strongly suggests an attempt to redirect the user to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://nipisod.ru/strik?utm_term=libro+el+principito+en+ingles+gratis PDF link annotation
    • https://cdn.sqhk.co/lilavokolet/0dwjiau/crossfire_trail_movie_online_free.pdfIn PDF document text
    • https://mefupawex.weebly.com/uploads/1/3/4/3/134317460/b5351723be7.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/b693a779.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/gjjXzBV/79902402335.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tevomenil/96119398231.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/foxit_printer_installation_failed_please_check_the_print_service.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/free_online_3d_animation_courses_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/29014541812.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/nimol.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/tipugifasebez.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/cambria_font_mac_os_x.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/breakup_day_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/42216567489.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/birthday_wishes_audio_song_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/glaucoma_guideline_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/braille_words_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/64031845724.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_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 5184 bytes
SHA-256: f437815d3af25e2f17cd86e8778a20b30a8e6c602b93a891c78d2a425f9925c3
font_01_sfnt_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 13204 bytes
SHA-256: 6052b5d69e13944a3faaecce49e7f62bb502db1eb4e9282518ce2a58ce63ad51

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