Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9af91edbcbe5012…

MALICIOUS

PDF

87.5 KB Created: 2021-09-09 10:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 27941e359265d538a6cd843e18921dd8 SHA-1: 9f5bbd277946403c177083c10db66f513a5ad854 SHA-256: a9af91edbcbe50126912795209c2efc6d6e58213f7ff775bcf82ad1be79e029c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one that appears to be a redirector with a 'download' term, suggests a phishing or malware distribution attempt. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the idea that the document is designed to trick users into clicking a link to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://philabc.ru/uplcv?utm_term=autocad+2018+with+crack PDF link annotation
    • http://mskabel.cz/UserFiles/File/telofawagimuneviwuzaji.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/subuxijejegumiwe.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/74948278072.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/zawimikotidirixufesaxit.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/27349410120.pdfIn PDF document text
    • http://temple.mo/userfiles/file/xajolokifuvoxuwisemajemax.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/gesuduj.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/45588338204.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/pejukogunerarani.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16137733abe3ce---kalaj.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/9754872153.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/36825566329.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/17843864800.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/27261350354.pdfIn PDF document text
    • https://pmms-online.com/assets/file/25869468295.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/92635969983.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f02ed16b5---magugoralasitosiwikimib.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/99853201792.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/variren.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/pizoriwolezavobufate.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109030001372693.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/xepejinuvinuliwizumogaja.pdfIn PDF document text
    • http://safarang.com/basefile/files/48499846338.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/werozapavilerodirumorewo.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/74594467336.pdfIn PDF document text
    • http://oilspecchem.com/files/ladivalujepijiri.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/relanapewogodowuko.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_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 18368 bytes
SHA-256: 20aa0e973d98f55b7a822ba801acc6899dbc036352041035f3d2b7f5dfafcd44
font_01_sfnt_off00011f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13734 10780 bytes
SHA-256: 686f92387f3ddaccfee4121461169c71522b2f6b7050f026df1259ada7163a83