Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7d587a1264e478…

MALICIOUS

PDF

92.5 KB Created: 2021-09-12 12:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 02fb7f711eb68ea287af3ec13b417282 SHA-1: 01ca5e5723f742fd9d92c23a2988a6b817ceb574 SHA-256: 0f7d587a1264e478c84c6fc5d109e80b1b857eb96aed19d00f9749c5428d903d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis indicates the PDF acts as a link farm, containing numerous links to external websites, with one specific URL identified as potentially disposable hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://1night2day.com/ckupload/files/jenuza.pdf In PDF document text
    • https://kermanrooz.com/img/files/73115562102.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/8138389125.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/tibilimif.pdfIn PDF document text
    • http://d-innovation.com/upload/files/1063273265.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/7a4c1ce8bead82361985ac506dc8409b/nalabilu.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/48941502917.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-2/20210902075047843275.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/6139036911.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/44029861611.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/27864320305.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/74342907849.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/tufamutezix.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/jiruv.pdfIn PDF document text
    • http://contua.org/userfiles/file/fasifedagidiwugan.pdfIn PDF document text
    • http://bamila.vn/luutru/files/tenilopu.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/76427628785.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/15278355433.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/35858881409.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/45672969316.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/57347306845.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/rilobomivan.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/miviwube.pdfIn PDF document text
    • http://oris-am.com/editor_up/nuzigulofatamipupamo.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109111132106775.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/40298659643.pdfIn PDF document text
    • http://pk.mo/userfiles/file/41179068037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=indian+idol+2016+winnerPDF 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_off00010395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAC 10476 bytes
SHA-256: ddd6ccc86a37998f806652d09f3d60263f661aab0a0d397580a6f9a65ee6e619
font_02_sfnt_off000133a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A3 18640 bytes
SHA-256: 45a97e0770093f0e53093f581af9234f77d8318da8cf03542651f4f9ab8ab7de