Malicious PDF — malware analysis report

Static analysis result for SHA-256 51349c9059572082…

MALICIOUS

PDF

87.0 KB Created: 2021-10-17 01:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fd0ad344efbbdfdbb5bb21c2f83a9455 SHA-1: 36d64d3113d18961bd3806fa4bca1d286d548b9b SHA-256: 51349c9059572082317bb4592b99177f85f91f4d18aa03887ba72b5b61347ec0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous external URLs, with one specifically identified as a link farm designed to redirect users, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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://crewmak.ru/uplcv?utm_term=stick+rpg+2+unblocked+games PDF link annotation
    • http://greenbelt.abwingsmd.com/uploads/files/52932975686.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20211010_2FD61E7A885B232A.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/87642937948.pdfIn PDF document text
    • http://www.moyekolodin.com/files/86431091985.pdfIn PDF document text
    • https://personnelstrategies.net/userfiles/file/xexuluwekubomegis.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/83594109149.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/93307265621.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f99f02328b---19097008857.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/xovoweka.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/24048599760.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///13556606526.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1890bff020438817fe4f5419f52a3f09/pugubixuvujuxu.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/wuzuletunikonejinukipan.pdfIn PDF document text
    • http://suaups.net/userfiles/file/zupemewexozisiwib.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/36219739093.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/68989654865.pdfIn PDF document text
    • http://vning.net/filespath/files/20210905075954.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/dumivosino.pdfIn PDF document text
    • http://debten.net/UserFiles/File/badelaforetevisuxu.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/11803788719.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/gibatanidefibufodovaliwa.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/gofevudemanegomaxizomimaz.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/50176282354.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/73913557093.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_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 17132 bytes
SHA-256: d25368e816966cc3285365682029cf867d940e39f9a9c3b63013bac2033f42b0
font_01_sfnt_off00011bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 11384 bytes
SHA-256: 264fc5c2307e1dab50f99cb85b294ccf980ce0553454f7b1de123dfe029245e9
font_02_sfnt_off0001365b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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