Malicious PDF — malware analysis report

Static analysis result for SHA-256 e891ab0f7cbca471…

MALICIOUS

PDF

77.9 KB Created: 2021-10-07 20:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b003b5876077c6ad8cb9765b1a7c9ccb SHA-1: a0ba1e94e65bcdd8c0da06db823435420b7a64b9 SHA-256: e891ab0f7cbca4714a827bf2a206ebbd7b0b19c703000de2d46d2ad65ab8003a
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 embedded external URIs, identified as a link farm on disposable hosting, strongly suggests a phishing or malware distribution campaign. While no scripts were directly extracted, the PDF structure and embedded links are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=friday+fun+quotes PDF link annotation
    • http://encino.kopanramen.com/uploads/files/44895342846.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/80690636455.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/27277711211.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/78317601011.pdfIn PDF document text
    • https://kar360.com/resimler/files/18240450293.pdfIn PDF document text
    • https://baldai.manovonia.lt/images/files/48555220514.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/37751482947.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/73356809168.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/tiromoxagoxalusemugalefeb.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109020306355173.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/benibopoto.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/misorebajogotu.pdfIn PDF document text
    • http://chromavials.com/d/files/tegugipofusalodogutunamaf.pdfIn PDF document text
    • https://sealskinz.ru/files/file/lesijefad.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/44110787682.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/19519639770.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/wogurem.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/61715444821.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142faf1b1966---suvafatipasa.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/xaxesib.pdfIn PDF document text
    • https://iword.de/userfiles/file/91586964499.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210914_023446.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/toverewabekifaviwopas.pdfIn PDF document text
    • http://indianamartialartsfitness.com/flash/indianamartialartsfitness.com/file/takegi.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_off0000c9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FD 10640 bytes
SHA-256: af1a08a14f91873baeef9956afebeb9198e10a6d6c2636d4ee4b2a5cdd9004ae
font_01_sfnt_off0000e244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 18184 bytes
SHA-256: eb93aafb52c8f160de789a5785a5882c0060776f388b8e8017a05529f1aee1b5

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