Malicious PDF — malware analysis report

Static analysis result for SHA-256 52969da92482b7e3…

MALICIOUS

PDF

83.7 KB Created: 2021-06-01 06:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 068ce332bf3a211eb3d5bb30f7df47b2 SHA-1: 82c306980dae36496d9a0ababdf2fe378c4532c2 SHA-256: 52969da92482b7e374388336be63db3e3e30d3debdf6eb4c885409291a6061ab
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://maypoin.ru/123?utm_term=android+antivirus+app++apk PDF link annotation
    • https://mivuwapirodi.weebly.com/uploads/1/3/2/6/132681474/natuposaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463551/normal_6019f09b23513.pdfIn PDF document text
    • https://kujiviremi.weebly.com/uploads/1/3/2/3/132302989/jabitivepimeb_bixitowajikuru_najowisum.pdfIn PDF document text
    • https://bewejagaseti.weebly.com/uploads/1/3/4/7/134708857/2216942.pdfIn PDF document text
    • https://bufodenoziro.weebly.com/uploads/1/3/4/5/134585066/1877933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_6036870c9f243.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xojifot.pbworks.com/f/taylor_fundamentals_of_nursing_9th_edition_ebook.pdfIn PDF document text
    • http://jetipufagi.pbworks.com/w/file/fetch/144437322/google_play_gift_card_generator_apk_android.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144412041/kulaguwerirulamaxuxegu.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/w/file/fetch/144413748/what_is_importance_of_family_planning.pdfIn PDF document text
    • http://zexowisam.pbworks.com/f/free_printable_horse_race_game_board_template.pdfIn PDF document text
    • http://wixugigir.pbworks.com/f/what_does_brand_perception.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/43358865799.pdfIn PDF document text
    • http://zekodunu.pbworks.com/w/file/fetch/144442881/bahubali_2_full_movie_download_in_hindi_hd_filmywap_2017.pdfIn PDF document text
    • http://kufavuva.pbworks.com/f/why_did_my_grandfather_clock_stop_chiming.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144412476/12513251710.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_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 5032 bytes
SHA-256: 9d69d3765234b2d438265f81ee3bf7fae7886b81d7a45fb8cc8d443fb55e5782
font_01_sfnt_off0001121c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121C 2808 bytes
SHA-256: d0c1be63c93e2b2fdc7110da2ea4141e4c4e3c815aa6d122ad4c83910e8ed355
font_02_sfnt_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 11116 bytes
SHA-256: 31490335c8282f399a108f0678c12977c7d259c031c8fe9392e6d00b58ad5c67