Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bd4246e819b8a7…

MALICIOUS

PDF

75.5 KB Created: 2021-03-20 21:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5d98b05375a76834cf73f9f245aba4d SHA-1: bb3852570038dcbcafde3bb178a429232abd6792 SHA-256: 13bd4246e819b8a7dc9091b004910f8b5cd501f112a48520eaf9c1ec8cfc1e86
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to 'ponafet.ru', which is presented as a discount code for Stubhub. This suggests a phishing or credential harvesting attempt. The PDF structure and embedded content are consistent with malicious PDFs designed to trick users into visiting external sites.

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
  • 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://ponafet.ru/wix?keyword=stubhub+service+fee+discount+code
    • https://static.s123-cdn-static.com/uploads/4493876/normal_5fe2be949603e.pdf
    • https://cdn.sqhk.co/juvebuzizej/p08UgdX/48575923147.pdf
    • http://gufutaca3.xyz/square_feet_to_square_meter_converter74pmc.pdf
    • http://4338bacchus.com/how_to_service_a_mobile_home_furnacehlmvh.pdf
    • http://dimax-matrasy.ru/66020647830vsf5b.pdf
    • https://cdn-cms.f-static.net/uploads/4492536/normal_5fdc32de5dc22.pdf
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/76d5d23d549a2bf.pdf
    • http://idealica-italy.site/dikalavilixulomon5uk0r.pdf
    • http://shop-onlinediscount.xyz/the_cask_of_amontillado_reading_comprehension_questionsf5p49.pdf
    • https://cdn.sqhk.co/fejovuwov/ghjybOW/pixel_tap_color_by_number_online.pdf
    • https://cdn.sqhk.co/wevemugas/jdjdnHv/wehrmacht_awards_forum_japan.pdf
    • https://fazidojerax.weebly.com/uploads/1/3/5/3/135328618/cdf0e8fb8458a.pdf
    • https://cdn.sqhk.co/nazujovo/irX3Qii/sonic_the_hedgehog_movie_2020_pictures.pdf
    • http://stassikorskyi.com/longman_dictionary_download_for_windows_8rh3sm.pdf
    • http://kigurumi.org/xejevovoxektocd.pdf
    • https://cdn.sqhk.co/xenudipu/sqjdsgj/free_online_photo_editor_like_pixlr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1a821a9a-6a52-40ac-a333-eecd487cb833/computer_graphics_principles_and_practice_download.pdf
    • https://uploads.strikinglycdn.com/files/97212746-cf1c-4364-bbc2-f6a29c2646a4/fazir.pdf
    • https://uploads.strikinglycdn.com/files/fb174423-22ba-4b0d-bc35-0cb76bc5f7e5/first_alert_carbon_monoxide_detector_codes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea73.bin
a04ce4500952212fec50ca382cd2f0d06b24f4cec16bf4f9e1f2aefb714257f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 5172 bytes
font_01_sfnt_off0000fc0e.bin
eca0efa5dbcda7307a18b74791aad6ecb5e35171ad98857694f0b77c886a65c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 10708 bytes