Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a38e432746d9e1…

MALICIOUS

PDF

69.3 KB Created: 2021-10-02 22:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01b4021c867a4a19204b8d34cf771563 SHA-1: 5faabed2c2ebf0ccee6c1c74c2d6182e8efb519d SHA-256: 54a38e432746d9e145986eda189e0c78f06d0e7d8040553626dd23279b453b67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely involving the execution of JavaScript to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=how+long+is+flight+to+hawaii+from+lax PDF link annotation
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/suvavalejuzimow.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/lokomufojitiref.pdfIn PDF document text
    • http://vttbyt-bvmnpbqn.com/ckfinder/userfiles/files/6780224917.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/lerug.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/zetawuvumadara.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/dimukutikezetuwabejabe.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85334596826.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/81028188387.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/37334905795.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad31c0d946---22048977045.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/wexotifose.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/jepijodowanan.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/88942443414.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210926115429.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/65345870157.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/magadikenozutamuvegatirew.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459dabe3817---xovaberasopawizenis.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/38608780293.pdfIn PDF document text
    • http://budget-pl.com/ckfinder/userfiles/files/turulogip.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/49059983301.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/95338419625.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/povitukig.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/fulife.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_off0000ae47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE47 10708 bytes
SHA-256: ddae182a4d5dfa062c0baad5121b5e9e719b42fecec38a094be834993bd66dcc
font_01_sfnt_off0000c6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000debd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 16164 bytes
SHA-256: 2b085398fd4ad1aeb1196990dbc0b2b1595f6f01c198c4898ce1177409e883f0

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