Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0f9a831b8cb873…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 04:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3b168f7a62b1957073f92b4ca1547af3 SHA-1: bb7371a60b14aecd8856448d821329095e3aaf8a SHA-256: 1c0f9a831b8cb873f8fd915c224bd2e6e7fcde06dc218952c729e8b50c2a6f18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF 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 for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://chcial.ru/uplcv?utm_term=distance+walked+app+for+android PDF link annotation
    • https://letajicikoberce.cz/userfiles/file/59435226434.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/zilizijawosamuxir.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/zewasibazunuji.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/roxajafegidu.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/xatuxixibiwijafagoxoti.pdfIn PDF document text
    • https://hinaweb.com/upload/file/99623749717.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/82126999669.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16145386cea728---nanolizavabonatopajo.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/nutipixudilagabevuvud.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021092005133973499.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/5073063016.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/tepakugilenezadujuraf.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210901052622652427jpe94o.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32676540888.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/xasivumoratesopego.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1040da145a525226adb9cc1034c01d06/25177187211.pdfIn PDF document text
    • https://hssanesteban.cl/files/40739310459.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/56998147130.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/44303771605.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/83060228117.pdfIn PDF document text
    • http://meta-min.com/files/kevizitojosasor.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/nikudutagopegitifemowakif.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/kovomasubogapelara.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/mezukoza.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/fiwejixawowabun.pdfIn PDF document text
    • http://info56.ru/userfiles/file/41447225460.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_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 10792 bytes
SHA-256: deec147f839a7bd86cd082e450ba280dc72edc17b460d676db9d128af58e12bd
font_01_sfnt_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 17396 bytes
SHA-256: 10e080bd21beb796e6de12f8c8df1636eb1de4d3241f34302cc0c240cbd62d58
font_02_sfnt_off00012797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1