Malicious PDF — malware analysis report

Static analysis result for SHA-256 765ac2edb18b0494…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 19:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e90e99ddbf0b48c851362b7c3f3c407c SHA-1: 85c90f5b9e095bfc81c3af66aa78c5be39d7bcbb SHA-256: 765ac2edb18b04943153713018f8e1948e5266f61619f496292eba420d0a5384
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=app+lock+fingerprint+premium+apk PDF link annotation
    • https://vico-immobilien.com/ckfinder/userfiles/files/35461217650.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/2890068329.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/fikup.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/80522546.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/zoveboragoselerewogone.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/64097871714.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/27134745781.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/sefowugokekogurareza.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4bf30b727848bbcf33a78996d8db3169/36393185756.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/80374803379.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/64853177402.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/moxubuzumigogosejedute.pdfIn PDF document text
    • http://dhf-china.com/d/files/91280130937.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/xuboxir.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/linek.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/fuwob.pdfIn PDF document text
    • http://metallpress.info/files/50457439066.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/puwisetiwetufutavum.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/julezaxo.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/fozerefesexanujogo.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/xidonetapa.pdfIn PDF document text
    • http://yibetter.com/data/files/tijexawoxiw.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/tapotawasi.pdfIn 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://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_off0000b1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B5 17808 bytes
SHA-256: 0f10e8d157a70ba4089b08cace42f7959d90fd6d8c134ed9f7b03578ee8e63b9
font_02_sfnt_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 10828 bytes
SHA-256: 046955ebe88ff0a2357227b72d52d7650eb3c49cbe42b377da9c5cf9dc049c9a

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