Malicious PDF — malware analysis report

Static analysis result for SHA-256 421cc91f052f97ad…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 23:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fda7a5b06f0e1c9930c61fc1d7c9a48a SHA-1: 017b6d7530559a04abe8404aadefa635449718c7 SHA-256: 421cc91f052f97adbf11dba60c4ca35fe44600718c9b45ee82ae11634a1b5f7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm hosted on disposable domains, with numerous distinct hosts and links embedded within the document. This suggests an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://fier-forjat-valimet.ro/ckfinder/userfiles/files/45309402091.pdf In PDF document text
    • http://energo-market.ru/sadm_files/lexaserupimafifotokigaw.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/munewelibufedizulenov.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/dijitabunaxerele.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/wuruveberufafir.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/14804911498.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/votixekujofatefa.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f69e1bca9---sadakivigixesepusofag.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-9/20210909025434180307.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///18203279206.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hfb6h396hdvd5nik33tf8feo1c/tatun.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/88425410095.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/gitokobika.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/sexemun.pdfIn PDF document text
    • http://medi-sen.com/files/files/puguziliwemewefigomi.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/33938065124.pdfIn PDF document text
    • http://4bx.pl/public/file/dubevupuvedazaf.pdfIn PDF document text
    • https://korankertas.com/contents/files/tedegun.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/70183542498.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/zadijufevawafivawafu.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090607155673499.pdfIn PDF document text
    • http://ndt-ultratech.com/files/sofajokuzukuruno.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/sejozusofipu.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/sulegepijoloziwepunigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=padmaja+udaykumar+pharmacology+5th+edition+pdf+downloadPDF 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_off0000c82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 17996 bytes
SHA-256: ac70e2dca01f462155b8cc0302d742e9ecbaf2e4e8044b4686d06fc14e149276
font_01_sfnt_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 11556 bytes
SHA-256: 8582382f789c8341ead23cd71a5b415621b2d37c1e0144c5a505d0e20df4971f

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