Malicious PDF — malware analysis report

Static analysis result for SHA-256 311d805f4382e17d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-22 20:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c43f9e0b9fd86bea55eb7e7617363c46 SHA-1: 5f8faf0b24ec9b0568542bd6b36052ab34c4acda SHA-256: 311d805f4382e17d440987888b96540920e96d1832b53c179101ba78c8e87820
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as a link farm. This suggests an attempt to trick users into downloading additional malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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 http://orenprom.com/img/account/file/xamapazesoxisefabeturewe.pdf In PDF document text
    • http://jinsonmetal.com/Upload/file/zesejovim.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/15010057357.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/dabasi.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/sonik.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae6dbe025---90539989030.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/39056266550.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210913161637.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/73942394872.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/jatulafegadimogepowoliro.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/fapokufasi.pdfIn PDF document text
    • http://chapelguild.com/images/usr/piredamitezafiwi.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210920164344.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/1093331627.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///banipidet.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/76065976988.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210902121041_001tgt.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/41555380032.pdfIn PDF document text
    • https://korankertas.com/contents/files/lolux.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/433204919.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/46935122894.pdfIn PDF document text
    • https://signika.pl/Upload/file/viwukovawijonetokixubad.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/lumadarokaxefizomisugor.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/23882104221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=music+mp3+converter+apkPDF link annotation
    • 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_off0000d7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 17328 bytes
SHA-256: b2ff196e8d1ce73e5f0034252685b58c9fe95db202b0bdd292b5172f95c293af
font_02_sfnt_off00011c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C83 10912 bytes
SHA-256: 7218ee0b7fcffa50ae92db78bb204d60b09b1d1d037178be465aaf07803f16f6

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