Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49bb13d439f73a3…

MALICIOUS

PDF

70.5 KB Created: 2021-10-01 22:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f836bb9340f33477224662f7098fd44e SHA-1: f57f04743c260f5e2cf925db2fe2c1f1cf282c44 SHA-256: c49bb13d439f73a3d161b2503ab757745bb39bbd60f0db8cbae1a26d42bdf22a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://laborke.ru/uplcv?utm_term=dragon+ball+18+naked PDF link annotation
    • https://kaparatt.com/images/File/73552339850.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/vepotuzogavowovifamuka.pdfIn PDF document text
    • http://fzxszpt.com/np/upfile/file/77120072414.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/xemadetavavexabikaxike.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/26066121271.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/xozozimulapogarenigarixib.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/13592947637.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/56658186122.pdfIn PDF document text
    • http://bjjiffy.com/upload/81409736267.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152f8968db40---lunowegukaj.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/25035688324.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16152a8ea78f2e---tutikusokenatevezosezijep.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/sasowadupedil.pdfIn PDF document text
    • http://unityproductions.com/upload/files/90314653779.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/30769596081.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/tebamukidowenid.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/metaginakavikinitugesopa.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136980dea74f---78630885846.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/zixelamoku.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/14397015762.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109130524022973.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/tudazop.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/42890830671.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/tepulomigazalulek.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/subifudulufufidizasa.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_off0000b1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BA 16372 bytes
SHA-256: 1a6c0a034462d21297966104edcd4d3ba11cf7876db8cf73f8fa3a0c28a960bf
font_01_sfnt_off0000dafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 10556 bytes
SHA-256: 7e30a8a8a8d1b01762db221e6a5e16cdae30aadc5c2816eb19c90c4fdac1c277