Malicious PDF — malware analysis report

Static analysis result for SHA-256 1476a90878e77870…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 12:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 223e7533c90d1c60585930464f217449 SHA-1: c6a12122ae0ae314dbbbfc6a9a5ef1e3e9733388 SHA-256: 1476a90878e7787037aca7bbc8d2acb5472d06e1e90a7f17eca054b593c9a9ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://oniceh.ru/uplcv?utm_term=free+mp3+music+download+apk PDF link annotation
    • https://zebcom.in/userfiles/file/pusurunadinesewe.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/binuri.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/30441940603.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/junapogixulurogom.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/87295618880.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131006c4dd14---vigiderijulejez.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/70725965984.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/61202837270.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210913_78D7F04AF5ABF895.pdfIn PDF document text
    • http://hangquangauto.com/files/69910124952.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/22598007645.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210902075134_3gehgh.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/jorexurepefotezor.pdfIn PDF document text
    • http://yepuco.com/uploads/files/62115218060.pdfIn PDF document text
    • http://gotween.com/userfiles/file///donililopusekifujeji.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/74997862074.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/79978861773.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/34071640892.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-1/20210901071823406720.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/rifagepadelibimuvevalu.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/gelowasezesux.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/36252216711.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/ziwowa.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/31594546121.pdfIn PDF document text
    • http://falerisztika.hu/tmp/47425717513.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/29387884574.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_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 17916 bytes
SHA-256: 755191708d01ba5fa779c97a731212dad4239fcb1a865e75a39cdd1deb35c2cd
font_01_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEE 11004 bytes
SHA-256: 4d5ffdb26464de6824ad73f4e7fa4bc53405748d11d0487a1044da963d1391cb