Malicious PDF — malware analysis report

Static analysis result for SHA-256 acaac0d87b857495…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 23:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d5365f700a1a5fb1e46fd0e3c65c1e2 SHA-1: 238ef3f04513375604a865ff7036e82f5c543219 SHA-256: acaac0d87b8574951246a64c6c57ba31921722b3f814f78260264342b8a1f334
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to distinct, disposable domains, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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 http://aviatechinform.ru/sadm_files/75844929286.pdf In PDF document text
    • https://www.alapan.org/fckimages/file/81267146003.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b74a3b08d7---sovowixen.pdfIn PDF document text
    • https://sim2007.com/files/linekojagabitotomadowiz.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/194767197161371656ecb5f.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/wolixobej.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/52352608600.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/73549188971.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/2162477618.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/28674615493.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/fasakotuxofogage.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/molala.pdfIn PDF document text
    • http://shesob.com/file/files/26444506218.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/17886850920.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/negidijolalu.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/warusikosebebip.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/5914874642.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/36516086659.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/75728086064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+can+i+make+my+android+camera+look+like+an+iphonePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB7 10796 bytes
SHA-256: 9918e1386b09e22dcbe33f388a0d133c4d5c7ec0465fdcc0bf1676a1dba4e8b2
font_01_sfnt_off0000c64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64E 16224 bytes
SHA-256: 4d4f76002393eeea48b5f51f28a74a7cb620fdc2537f77ba29525e1b25bbdfae
font_02_sfnt_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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