Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32edc3c8a2fece1…

MALICIOUS

PDF

79.1 KB Created: 2021-03-18 05:26:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 26b89399813a09298677d9d2af3752f5 SHA-1: 189c64725b95d7df9c0077511e573a5f2c2b9c2b SHA-256: e32edc3c8a2fece159d7b6795ef3d6a685a90a881763754244043baa3f848c38
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 0.9993

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://midufefew.ru/award?keyword=encyclopedia+judaica+pdf+vol+10 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367313/normal_600675c59f85f.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/bugibupiwupixajezakafowugahc34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_602ee1ca840bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416927/normal_5fda8fcb5f9b6.pdfIn PDF document text
    • https://cdn.sqhk.co/jedetanepiz/vKQKihj/mimal.pdfIn PDF document text
    • https://cdn.sqhk.co/pesasotiro/igjcjgn/musicals_movies_list.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/ifjcNgd/pizza_boy_gba_free_gba_emulator_download.pdfIn PDF document text
    • http://lazadacostumercenter.com/27550770725iqdvt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448980/normal_5fc99f8fde492.pdfIn PDF document text
    • http://20970907.net/lean_startup_eric_ries_ebooksv1i2.pdfIn PDF document text
    • http://demask.fun/asexual_and_sexual_reproduction_worksheet_docxjavl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5fe98ba03e55b.pdfIn PDF document text
    • http://i-men.ru/what_is_mini_mental_examinationt3wma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_aea2309d1f1e43ea89d3ae14a0e1738f.pdf?index=trueIn PDF document text
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_8bd335498fe64932b3def8fa89dcbd84.pdf?index=trueIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_ce3735dc982c481cac64ab1385843df8.pdf?index=trueIn PDF document text
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_1297ccd3b9084c70babc1ce7eb9a5996.pdf?index=trueIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_e6da2eae895c46d49ee4e4a982eba783.pdf?index=trueIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_47c9e8f705f34bc1931cff080e435b88.pdf?index=trueIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_32a0a61664b54885bf1ef549af3ea404.pdf?index=trueIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_9af243e54d1e41ad8cbb3e8af92558cc.pdf?index=trueIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_0a984f75c76a4e47992fa2009daaf4d1.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_6f5c3b4661c441c5921eeee8a0848c1d.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_62d58a72029f4d8bbdfcffb508f68d0b.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_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 5264 bytes
SHA-256: 3b5391aeb0094ae77071c8e62aa47ac19b9f723b348cb980137d1d00ea08e34f
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 13476 bytes
SHA-256: c8b4a9ea7a3312754690eba5c64a1fcbfa160699dcb971984356a14371eb6a22