Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd1a558abb5494b…

MALICIOUS

PDF

77.0 KB Created: 2021-09-19 23:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9bf2a5277fd1f5ff46ac2ae0e4e70e53 SHA-1: fffc33c33599d12751f841ed8965ad8aa4b270f8 SHA-256: acd1a558abb5494b23762272d998ab6cc7e7eb143af9437fa206e098fc9f4c8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=how+to+transfer+data+from+phone+to+memory+card PDF link annotation
    • https://renesens21.com/ressources/upload/files/wojukuvupaziw.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/tabasoluralaludixal.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/tulefewig.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210907031837.pdfIn PDF document text
    • http://techbis.pl/files/file/52604559623.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/fedenemukasono.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/laresuxajeregefu.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/nijibivenigedo.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/zemitutazaja.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/44752193285.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/68379832017.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/6862446192.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/7691910737.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/be3133fbac24418d9fa5178bc3ffaadb/wilarano.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/mezusolovasaru.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109020225146818.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/nezemovogiwef.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141620b0596f---wapugogotizobisamiv.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/83933172068.pdfIn PDF document text
    • http://classtool.info/upload/files/66756622182.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/22812799104.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/66057533383.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/pifisafujabinelojiluj.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_off0000c9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FE 10940 bytes
SHA-256: e6e89066a2c1619aadc06cd834ea5cfb5f28f861a7da2e9a16c3d165e6e71859
font_01_sfnt_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 16844 bytes
SHA-256: a33326cb1e183e9abf609d2e67c629113760a90bf2f5743c5d7027c6839cacac

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