Malicious PDF — malware analysis report

Static analysis result for SHA-256 872c522ce50364cb…

MALICIOUS

PDF

75.8 KB Created: 2021-03-16 17:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 975cc9c1d77b0cb5d39ba8cc6b8c73ce SHA-1: 923cf17762bd0c062abe72a7f67616e30b7b4bfd SHA-256: 872c522ce50364cb6990bf95da0fc46361b2769744929061d00b539c107501e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and 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 0.9991

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 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://bologen.ru/wix?keyword=google+doodle+games+tetris PDF link annotation
    • https://cdn.sqhk.co/rokijatu/oa5EiiW/21670064665.pdfIn PDF document text
    • http://vuvodagedene.scienceontheweb.net/gigikogebitewibalafora.pdfIn PDF document text
    • https://cdn.sqhk.co/xapewiwud/0gegeig/among_us_free_skin_download_pc.pdfIn PDF document text
    • http://cocobeautybar.ca/funny_pictures_gif_animation150o3.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/vvhgieZ/sparkle_effect_photo_editor.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/6tB8GIj/91570560671.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/tayc_5_izleau0o5.pdfIn PDF document text
    • http://fitness1.space/kazawotererenamedopalimoxtzsy.pdfIn PDF document text
    • https://cdn.sqhk.co/mamozinuba/xmihgcp/clash_royale_hack_generator_without_human_verification.pdfIn PDF document text
    • https://cdn.sqhk.co/josozudibud/hgPI1DK/77245948488.pdfIn PDF document text
    • https://cdn.sqhk.co/nezerozara/igx5idv/dalutakefujowokedodo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a181bb3e-7445-4f1f-a1cf-b2fe66c13e92.filesusr.com/ugd/91ce54_01a8803aca404152969f495df45be92e.pdf?index=trueIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/tabuketibufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/985de5f3-8968-4b9d-ab6b-7fac3aa58024/75767228666.pdfIn PDF document text
    • http://jatoxat.atwebpages.com/injection_surjection_bijection_exercice_corrig.pdfIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_3025ab550f8e45b098c1f9a22ee2fbe3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/049fbe42-bfdf-439d-b907-8960a4bb4802/kozofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6378fbc-3cd9-4590-a609-22e931a8b409/how_to_clean_haier_washing_machine.pdfIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_36f7a786002e4ab0b5ff16ef34a4836c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eee44ab-dae6-417d-9628-1ecbd75113ac/if_he_hollers_let_him_go_1968.pdfIn PDF document text
    • http://nopugorib.onlinewebshop.net/how_much_does_it_cost_to_repair_charging_port_iphone_7.pdfIn PDF document text
    • http://pefimubis.myartsonline.com/how_to_pair_bluetooth_remote_with_ps3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c5d454-4505-4d50-8e92-296503145870/very_short_panchatantra_stories_in_english.pdfIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_90c9e225fb444618bbffabb627e269c2.pdf?index=trueIn 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_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 5176 bytes
SHA-256: cde545c41717355955df56dbb3c00c022f2d7f2b9e0914ea056eae27bf918950
font_01_sfnt_off0000fb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 11448 bytes
SHA-256: 8d9b819e4bd361819d35ed4b041b74c1f6744812a651bd90fd9883acd695b7ae