Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ac8bcffdf3f363…

MALICIOUS

PDF

68.6 KB Created: 2021-03-15 01:54:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f352591e15d49c290a1860a8e64f6d2d SHA-1: b15fc825cd7fba94ac5c95239dd08403ded700d3 SHA-256: d7ac8bcffdf3f363d59f7011c1e23512d309a4527b373196b81c39ee755ba97f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The presence of a URL related to 'super mario flash 5' in the document body, combined with the ML classifier and ClamAV detection, indicates malicious intent. The primary goal appears to be directing users to potentially malicious or unwanted external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://seumenha.ru/wix?keyword=super+mario+flash+5 PDF link annotation
    • https://cdn.sqhk.co/xotosobupis/bIsT9S3/tri_blend_t_shirt_fit.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/hhNiihd/best_deals_online_shopping_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/8zy4AUJ/gravity_falls_mabel_voice.pdfIn PDF document text
    • https://cdn.sqhk.co/komiburufezo/higeljh/dead_space_3_mod_apk.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/are_delonghi_and_krups_the_same_company.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/ficMIgg/37539119752.pdfIn PDF document text
    • http://ruvogodozipabiv.scienceontheweb.net/mawalikikumuzogofik.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/how_to_check_hp_instant_ink_levels.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/ehcHiev/49625698784.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff00678-f268-412c-b5e3-067c28a07ece/what_is_a_loan_operations_specialist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63be19c1-25d4-4ec0-8b7a-155e30fff752/suncast_garden_hose_reel_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/video_er_free.pdfIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_aa4c69639749499b9ecba15388b4e98a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c8b9af-9de8-4800-a911-12b40db66826/how_to_use_noaa_dive_tables.pdfIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_0440bdb6ef71453484ad6952f0ba7fb6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/ccna_exam_fees_malaysia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d648f74b-05a2-4660-a7a0-76ddec8cc9fa/how_to_teach_main_idea_and_supporting_details_4th_grade.pdfIn PDF document text
    • http://nivuzujanux.myartsonline.com/64928725008.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/algebra_lineal_que_es_una_matriz.pdfIn PDF document text
    • http://giworutiw.myartsonline.com/dave_brubeck_take_five_album_cover_art.pdfIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_d37da393f7eb496d9df5a010ec261491.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/998778131.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_off0000d07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07D 5368 bytes
SHA-256: d03a2820fd7e437c1df49d3a30a8bdf2f3a99712234c61d2dac412320f53c33d
font_01_sfnt_off0000e293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 10312 bytes
SHA-256: 58733a00ef35f7f7ab520d6ac445d6b78c3d3bde11c2c806b895796d3292d232