Malicious PDF — malware analysis report

Static analysis result for SHA-256 158926c0b0e2a714…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 10:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3a0c208775bfeae4953dc668e6d24d18 SHA-1: 82450529222967511c7489389f2df468c9f80bd2 SHA-256: 158926c0b0e2a714adb2c9ed04a65a7aec4916806078bebe54f858345e499b08
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 and an ML classifier, indicating malicious intent. The presence of numerous external URIs, particularly those identified as part of a link farm on disposable hosting, strongly suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URI findings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6541

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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=star7+live+apk PDF link annotation
    • https://weborder.cloud/userfiles/file///97569440149.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/zibosivimarekud.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/47198164886.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/kasubax.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/fisolagupagidojet.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/3424062712.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/moxizisipeke.pdfIn PDF document text
    • http://sksound.com/userfiles/file/gadirubotoditakef.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/88019190721.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/linekamezowerebusagoxajab.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/71067005086.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/81064967228.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/tideraxiriwos.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/kalemigisezaruxarivesokik.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/tulorekunamoz.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308248cadb2---bavuv.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/senigitixokid.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/20050164350.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406bbe49a0d---82074906748.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/davibelalubirelaf.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/86874755923.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210914182907.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/68949381143.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/57791414503.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/97327845936.pdfIn 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_off0000d3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 10136 bytes
SHA-256: 4c25105e535efe4d885896404758bfead37bb3b79396e05b490d4897c3c87b1b
font_02_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 17484 bytes
SHA-256: 4c2e1583bf9b1e8e39b8085c269cf0cd4600fab272119ab38dc3329b281bc182

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