Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2ea591e3a997ea…

MALICIOUS

PDF

78.3 KB Created: 2021-03-08 16:44:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 76109b58e894836d1709e7179222c565 SHA-1: 1382970f7858dd8850e596da93b4cae63e7d294d SHA-256: 4e2ea591e3a997ea2a1b33c3dd840c253472f80ab3fc22bb5eab38d4599a1359
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=marathi+barakhadi+pdf+file PDF link annotation
    • https://cdn.sqhk.co/jogujufuza/Jjgff9e/lupatatizexeverufa.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/hKcgejh/fiwesezebopesozixu.pdfIn PDF document text
    • https://cdn.sqhk.co/tijaxasazuwi/vmggwhg/fasewowikewuwujame.pdfIn PDF document text
    • https://cdn.sqhk.co/zozotetowa/iDphihd/paintball_gun_tank.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/cQ2UFie/fancy_pants_adventure_world_3_remix_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/jdjage2/69911607315.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/Ohgjjgg/business_courses_at_king_s_college_london.pdfIn PDF document text
    • https://cdn.sqhk.co/zazavoxujub/hbNgegd/ios_core_graphics_draw_line.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kufazete/ethan_allen_tempus_fugit_grandfather_clock_value.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_fbf12809a18e4d77b21ef157c36f2875.pdf?index=trueIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_094999d86e57401fa5a43e68e78176c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/uniden_loud_and_clear_dect_6.0_manual.pdfIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_bb6758bcb4fb494e8a814c8110885145.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_33e88e76ce38432ebc7afcf5f7f461b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/winumigutam/36061029450.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_4c00ae93ed98448bbfa05a67b1354154.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/lipuwimedipopizubololazi.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_4aa66a9b4cf54903af08d16d03e34ca9.pdf?index=trueIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_02195bdc083e440b9831337abcd81f8f.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_1598ce1079e742469d4855eb28511cb1.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_off0000f67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67E 5160 bytes
SHA-256: b10917ad74e06ae5c29639265bf4e8c9a5456ce5386e20f7298dc6ef2a56a3f2
font_01_sfnt_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 10460 bytes
SHA-256: ecc26e6b7ad7993462db47a1aa15c97e4cd18e2a2f643b83b35c13a1d5ca4574