Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0dcfba9de1b5918…

MALICIOUS

PDF

86.1 KB Created: 2021-03-19 08:37:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b7ca0ea50c9c47f76977ba8a93b54e35 SHA-1: e97c563c12d7add42d97e853db715698e719d567 SHA-256: c0dcfba9de1b5918a3466c8f2009bae399df5efc48b767dcf110db690fb8d7c5
186 Risk Score

Malware Insights

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

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 0.9994

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://jacksth.ru/wix?keyword=14+days+left+images PDF link annotation
    • http://sozaxesugoj.mywebcommunity.org/the_adventures_of_huckleberry_finn_summary_chapter_14.pdfIn PDF document text
    • http://visunuduxat.mypressonline.com/biostatistics_journal.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/Qjaifih/zoripi.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/iwnkia5/jetulilef.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/line_6_hx_stomp_vs_helix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_617b10c3417041e8ad7fcc5858a6c6ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nupotukig/dosetezakubuxuvewodim.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/98196217924.pdfIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_092907697f7a41f996b038cab7d5060b.pdf?index=trueIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_d70b1d63215b441492594db7167f33a7.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_acdce74b91cc4fe1a58db90f14a7fec9.pdf?index=trueIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_933c697b780b48368a6451e975daed07.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_8f7c6311ba564723819b6b0db6417ca1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gazivemon/xetetevalugubolisagobid.pdfIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_b2860f0b90e4455da6ab9acb54327bdf.pdf?index=trueIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_ae68a7bfcd8b4999808faf4328e7b7a9.pdf?index=trueIn PDF document text
    • http://magegefopo.atwebpages.com/learn_autocad_basics_in_21_days_free_download.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_e756361116984bc08ff46df185846c94.pdf?index=trueIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_1d03e43cdf784c3880409eedb2887c63.pdf?index=trueIn PDF document text
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_786a2a476d754fa1b7c9163cea2c05a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovugi/oxygen_49_keyboard_no_sound.pdfIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_0d3301dea2b042188a2fff1996f1038d.pdf?index=trueIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_3195989dc38a4596a5e3ca01f38b4204.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_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 5276 bytes
SHA-256: 895d03278880808201b629685352c4cd28c70624b34c768a521fc01507751a37
font_01_sfnt_off000124e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E4 11236 bytes
SHA-256: ee5535c750e69a81b9a50eed818df2f76f0cc89a69ea0309b6d3ad77b6ddcd40