Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f90414214422ee…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 11:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 854a93d1ebac023f5283b111e01e605e SHA-1: ec1982fa825cd36311483e2b0697c429370f85ba SHA-256: 89f90414214422eeef9780c745a666902b4462aa57ce5f68ed54acacc4e53ee8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=baixar+aplicativos+apk+para+android PDF link annotation
    • http://auxerretv.com/content/public/file/98459901534.pdfIn PDF document text
    • http://altus.pl/userfiles/file/worera.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613af84acc936---19067242750.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/92598045677.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/zexuzonararefulamem.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/22178523600.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/30467556916.pdfIn PDF document text
    • http://01host.ru/userfiles/files/kiwogexeli.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/rumiji.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/16115767846.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/4528347790.pdfIn PDF document text
    • http://freetds.net/userfiles/file/vadex.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/9f05e9e9e28768cd17cb70825da62147/puvugupufebun.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/sidowazimebexixi.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/1870540100.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/65753527371.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/96281556645.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/69697414695.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/dixojadagemuzi.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/47772423090.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210908201823.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_off0000ca59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA59 10688 bytes
SHA-256: dfb98daed951411fbbac44507d50f220fa878af7e5781e0582ab69c82b86bfc4
font_01_sfnt_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 17552 bytes
SHA-256: 86463cb7db7c17076e7e5e5b43080d9c52056d6bd1c0f766ec7088defb15e591
font_02_sfnt_off00011129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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