Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7b040de17d0045…

MALICIOUS

PDF

88.8 KB Created: 2021-09-10 14:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ba1adbdbd6f46d5c633904455be8ded SHA-1: 2c3363dfbdda03f7f014d135ce09b5618b41bf11 SHA-256: 5e7b040de17d00452baaa1c41c2b10e17348b5b1a75d57ab21dc7d670883b7f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=the+invention+of+hugo+cabret+book+pdf+free PDF link annotation
    • https://cmfnepal.org/userfiles/files/57045371167.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16139550c91e9e---kazewerinegov.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/bibowobavuxipej.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/selak.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/xibakagodaliperowo.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/46018111031.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/retuterojunazeluwozijikip.pdfIn PDF document text
    • http://klenderbio.com/upload/files/34191782750.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/betened.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/33711058444.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/8107006550.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///28346038748.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/62140024963.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/5992978618.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/40074723951.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/2061433860.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/69012629945.pdfIn PDF document text
    • https://wecareprogram.org/images/file/5255000785.pdfIn PDF document text
    • http://asid.rw/userfiles/file/futerumedunazuboxuroli.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/35676626286.pdfIn PDF document text
    • http://carszana.com/image/upload/File/miliwedutezewivawerojom.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/laluwetajuruzalu.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/66941207400.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/dawifubafudifaji.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/70857377770.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_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 18660 bytes
SHA-256: 8e8d653a7cb31732f487cc7422de60231a65850349528f6f45adb7c4b6a01022
font_01_sfnt_off00012402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C19 11048 bytes
SHA-256: e1bfe9c3a91cfd9d338f2b17414cc1670d724ab44fc74eb3f16823ecbd01fdb4