Malicious PDF — malware analysis report

Static analysis result for SHA-256 789b11b67e44e4b4…

MALICIOUS

PDF

82.8 KB Created: 2021-08-20 15:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f000d896e56c1f657a8ec366d8be0424 SHA-1: e884328e672baacd7aa8c3ee264a50554e1e5a61 SHA-256: 789b11b67e44e4b4d536702eb60030488e894d556888295d0909325ae47631cf
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 for 'Pdf.Phishing.Trojan'. The presence of a link farm on disposable hosting, coupled with numerous embedded URLs pointing to PDF files, strongly suggests a phishing or malware distribution attempt. The ML classifier also provided a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://club-sports.net/uploads/products/files/sosikasom.pdf In PDF document text
    • http://quaretti.it/userfiles/files/wawurabipugoditavinipa.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/34586236597.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/92270228605.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/woduwudexakeparosutevir.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/706722674.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/japanitubipon.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/4c0e1b3dea93740486d3b31b86928231/simuzitaviwigigofazip.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/dasemixu.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/golakesibexameguvorekixev.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/53162729987.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/55279713669.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/26414536430.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/gudiper.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/56219088242.pdfIn PDF document text
    • https://heyratacademy.ir/file/74642597718.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/97368870162.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/risinatavezuzitabufesiber.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/65924845512.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/toturenadadedak.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/vejubadab.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/84527157870.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/18985607708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+kumpulan+lagu+keroncong+koes+plus+mp3PDF 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_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 17644 bytes
SHA-256: 6709cbdc59068a040ac64d7a6328f3a51728c35b4f8257376a5215b765c36146
font_01_sfnt_off0001095f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12176 11116 bytes
SHA-256: ac71ac4ba10e8b4d93a824ce31f9e20d04cbc40d5108d1281124914c505508ba

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