Malicious PDF — malware analysis report

Static analysis result for SHA-256 54641b7b3736c8a1…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 07:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 51056dc7643ad016e8709d4a817a03bd SHA-1: 5f6be079456ef9829ab0f1e448cde1767cd9924b SHA-256: 54641b7b3736c8a1cc1bcc7254cf33420c53b86b085f7eaa59c53641625f99d9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous URLs on disposable hosting suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious verdict, with the embedded JavaScript likely facilitating the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=video+downloader+mp3 PDF link annotation
    • https://eric-parnes.com/ckfinder/userfiles/files/wemasijupevikaruzuviz.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/natakagawisazuji.pdfIn PDF document text
    • http://asqcert.net/files/files/renorasivagarorupig.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/favuvetetujir.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/54681371761.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/sulule.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/supapakedenaxunujurexa.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/4381565197.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/64517046137.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145c3e830b4d---zepurunikewonuwin.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/30101373868.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/rusudepeb.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/fudumawo.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/mazabezenojanaxuxakuw.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/6585560724.pdfIn PDF document text
    • http://esangsok.com/upfile/files/bulizopurokirerefikega.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/rederuput.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/komivowetifivuzav.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/liribifelupuwu.pdfIn PDF document text
    • https://hgb.se/filer/file/vipozuvekosinefodorusemub.pdfIn PDF document text
    • http://biomehl.com/images/content/files/xifegomurovo.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445b5698313---80809741230.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_off0000b0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0ED 15500 bytes
SHA-256: ea72fe3f0dfebd4d2cb0f394dc3ad53b7c086f25ab93269eb5198f8c69203a65
font_01_sfnt_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 10512 bytes
SHA-256: 2706a5ff0a0ecd6b428e54b4e4aedb152b43c0797ae87717b040f4bd28fd72e2
font_02_sfnt_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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