Malicious PDF — malware analysis report

Static analysis result for SHA-256 9faad629ffd85409…

MALICIOUS

PDF

69.6 KB Created: 2021-10-01 13:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 844393abae53f105556ab48ba98ec447 SHA-1: cf3e22b214d4e484ea8cf73ddd8e6d8bfb411125 SHA-256: 9faad629ffd85409d1301f4aec41fd6b8a25b5a6e5d2ca56431c8d51f9772f7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59341219812.pdf In PDF document text
    • https://cheesykeju.com/contents/files/7655313438.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/juxubikipeli.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/vigitefupesarazoxeno.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/bibafelozoxafigudilo.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/62147455214.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/6276804204.pdfIn PDF document text
    • http://juentai.com/userfiles/files/zoguzivagetixefobimen.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/mudiw.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/50948102771.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631912793.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/65911622701.pdfIn PDF document text
    • http://hevolta.com/upload/file/gugafukubuxin.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210906012702578.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/34351392884.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/1rlp0pgbd2u2p5nm0f5nmnufsu/70092636601.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/sixari.pdfIn PDF document text
    • https://granitnet.hu/editor_up/sisuvorefusivofux.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/zapibem.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/26131715566.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/11805146898.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/23988190582.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161390fcfa4670---87751960795.pdfIn PDF document text
    • http://cpils.com/userfiles/file/97330283505.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/rowagafedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=vivah+film+bhojpuri+meinPDF 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_off0000b0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DA 15656 bytes
SHA-256: 29e815bfd965d086f5ac7ce87a791b0487c47660084474c108027fe56f7c7ee6
font_02_sfnt_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 10764 bytes
SHA-256: 12c94380f557d01ea666fd951c7e5e916c735b15e8f57c780e87495b15228dca