Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1047ed14b9da36…

MALICIOUS

PDF

78.9 KB Created: 2021-09-12 09:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8763e3b202d9ad94fe0532321202bda9 SHA-1: c01be0dfd9be0ed0f8e1f19bb022eb7e4be13405 SHA-256: 5f1047ed14b9da36d8e877f685e0d484117502d2a4776dae3d99b9524b8dfddb
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, including one pointing to a raw IP address, indicating an attempt to download and execute a secondary payload. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution campaign. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=xiaomi+usb+adb+driver PDF link annotation
    • http://ivelinabozilova.com/userfiles/file/dulejivituvozoriludod.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/49372545508.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/mupelosu.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/wadogoxupojezolife.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613182f223731---89083695959.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/banoxiwezuposuvebaz.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/rumadigevigosumeta.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/vumurekuvikapojaboredelo.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/lejazisiwuli.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/53719089085.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210910092028.pdfIn PDF document text
    • http://exim5.hu/_user/file/joburedid.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///niluxosojizabi.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/84431686760.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/dedugimekafedefomaxatokip.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/7922689401.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16139088c37138---34481521615.pdfPDF link annotation
    • https://ph2020.org/ckfinder/userfiles/files/6895721322.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/57256961442.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132558be38bb---nagunux.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/34198498983.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210904_7DAD66C7DE7C1DCA.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_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 18288 bytes
SHA-256: f7d9014a90e972b97df049fa51de0085636c88dd659eda8af5b372b0858a4cae
font_01_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 10476 bytes
SHA-256: 4a46f41f219ed4de5dee1c354c80a03c8342e2a3b03ea5c1eb71f5005a19c01b
font_02_sfnt_off00011678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1