Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb55626f319c4f7b…

MALICIOUS

PDF

77.8 KB Created: 2021-09-16 09:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a65024815cd064e770f5cc73216541c2 SHA-1: 375368e34c8e313e39b401a62fccaa8a7599468a SHA-256: fb55626f319c4f7b9c418873813582fd7a494b6c57def969dd3f8956b92bd14a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded links pointing to various domains, many of which are likely disposable or used for link farming, indicating a phishing or malware distribution attempt. The presence of external URIs and the overall structure suggest an effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=secret+text+messages+android PDF link annotation
    • http://ros-grad.ru/fck_editor_files/files/gumetowiwadozibuguwiga.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/6200274302.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/mexopojubagonogoranepovi.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/tifofin.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/kekajewonobufudu.pdfIn PDF document text
    • http://kunbot.com/upload/files/lagepalare.pdfIn PDF document text
    • http://didopack.com/files/gulamifirimujesamefil.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/15924116186.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/fejor.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/27533422782.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6f9452dba45124b407c8b7ba934455c6/pofijebesojulunev.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/nokokapenepivijotumopelaf.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/xinuvarejedezopu.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/69152660731.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/xibowivalike.pdfIn PDF document text
    • https://gencatakan.com/upload/file/wefuvenekabuxebeb.pdfIn PDF document text
    • http://bndweb.nl/upload/files/diromaju.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/33264426084.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613616e950a71---ziler.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/65353598714.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/74933419797.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/72944272320.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/miwiwisopov.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_off0000cae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE7 17812 bytes
SHA-256: 8d1c9af4281f5c674cb11c1a72c06e67fba92e7db3d793f6efb29005587f8d01
font_01_sfnt_off0000f8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 10844 bytes
SHA-256: 6b779d0fa9f9c12f29412ce3bee6bde06f452ec00cbda900e734989d833aa28e

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