Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf3d714cdcd378d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-22 23:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 98fe9571e952375767bb8d72c671287a SHA-1: 3bf8feffea3c8052e03288fb77d381f5902e4078 SHA-256: 8bf3d714cdcd378d4207d78f191c8ef707092e75859473d62780e04bf72ecda9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with heuristics identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://highendschmiede.de/highendfiles/file/24224620361.pdf In PDF document text
    • http://sxhk365.com/uploads/file///sedapenelowu.pdfIn PDF document text
    • http://vln.nl/files/file/43558816196.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/paxorozif.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/29328266170.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/31857645289.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4f7e7671b---52460142687.pdfIn PDF document text
    • http://cartopack.be/Images/file/10432531591.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/mujipufopaviguzumodi.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/dirosuziguvepimo.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/mirifutafakanuvixiso.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/ramibawisunawevatowofigut.pdfIn PDF document text
    • http://electric-kernbichler.at/porogujulinigowiwesasexef.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/29048601477.pdfIn PDF document text
    • http://coachhouse.info/assets/file/nukejovafunidonobuwog.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/60483173521.pdfIn PDF document text
    • https://vgcanada.com/userfiles/file/pabipedizatu.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/36695913279.pdfIn PDF document text
    • http://eventpro-kontraktorpameran.com/uploaded/files/xuwaxalidelamuwa.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/pufubaponamavuvo.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/nufutovokolizoguduvowege.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/nawerekuragarinazeke.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/luvuw.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/36461099248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hancock+streaming+frPDF 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_off0000d15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15B 18420 bytes
SHA-256: 187e5c1c41cfa8658b4b90dec3a058b8d2d1e31ea78cecdd78d5edc726918617
font_01_sfnt_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DF 10716 bytes
SHA-256: a874050f881d1eb6a9e67651470e443e29130d0508af0b0df3b26215242e1d46