Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af1ec241ba2da17…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 16:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e856a07e6242ac6011ad5c1b9934f406 SHA-1: 928d556ae5a708353d3e7393bb7804c1257deddc SHA-256: 8af1ec241ba2da171753e66faae021edbfdf9092c6b16f784cbdcf0bd8fb5867
134 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, and contains a deceptive download button. The presence of numerous unknown URLs suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139de95a713e---91875182599.pdf In PDF document text
    • http://skiflogistics.ru/userfiles/file/95894377411.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/22825304738.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/51576377654.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/jorepo.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/1850520172.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/gozepafimelewojap.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/30953880994.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/57072145918.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/sizifabodumona.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/17400695175.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/gagosabubonojon.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/puzarajukuj.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b253babc3e---rekega.pdfIn PDF document text
    • http://intersonik.eu/upload/files/junibakol.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/3765323956.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/61519808602.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/wuretifaxutotojajudos.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/91337149691.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/tuzukavenid.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/20334183521.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/22159820027.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/lusepo.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/negijapupi.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/tanodavinavaxaxonudurute.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210907184745.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/44149018954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ppsspp+dragon+ball+z+shin+budokai+6PDF 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_off0000db86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB86 17924 bytes
SHA-256: 5429e5d671834741f2699bd4d402e1318cc3039cf8b6029c8bbe13ed527eb7f2
font_01_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 11000 bytes
SHA-256: f12fd26a3161310a707c405f44d516190e1e1e16c3dcbe9d5417ee3aab03cb23
font_02_sfnt_off0001232d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1