Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9fe26d4a18c478…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 10:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f2c85e9291f183399226e06e8cafe95 SHA-1: e9ec9b9a33497564c1d4dea6b5ca414c7931bb94 SHA-256: 9c9fe26d4a18c4784a57f1340bd38ded80bafadfc96173df694f80caef1e2a78
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious. The presence of a 'download button' heuristic suggests a phishing or social engineering lure. The numerous links to disposable hosting and the use of UTM parameters indicate an attempt to distribute malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=below+her+mouth+full+movie+download+bluray PDF link annotation
    • https://er-cardiff.com/eurostyl/photos/file/76801158424.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/pusez.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/39296017125.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/28796658041.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/pakugetewexef.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/puxigekumeduja.pdfIn PDF document text
    • http://www.bash.cl/media/file/linajujelalesiboj.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/bajasajepobumiko.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/45835466719.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210910134502.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613285152f36e---lalazidibidodafakevowo.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/10702428869.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/jizololesatasixozesodowar.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/22620401145.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/xevutun.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/4749109434.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/33109917564.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/54925928707.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/wefuka.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/miporobosobokagogixedix.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/wimawit.pdfIn PDF document text
    • https://dm288.rs/slicice/file/nafekikefutorixan.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109131732567765.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/gixebuxurifunofepuduvabub.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109040455043105.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_off0000e150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF967 11012 bytes
SHA-256: 1a956df9db89f3dd9da7c4100459a6d509c9dd87edff22864d9983f4285d8ec6
font_02_sfnt_off000112db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DB 17692 bytes
SHA-256: 7b5d489089c9062d3a334fbc1c32fbfc25f71f5b214456c603bd54ed2854c32c