Malicious PDF — malware analysis report

Static analysis result for SHA-256 431420ca5503b359…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 11:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b01ad1af926aa512d13ef5402033bd12 SHA-1: d3bbb8467caeb24156a9f71932fdbf0fd6bb9313 SHA-256: 431420ca5503b359bc48b49af5b6c258b221942eb53204ab8aaeafab6cd98cc7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of a 'download' button heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=wifi+site+survey+android PDF link annotation
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/91431289237.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/lezifosasokidexalo.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/36672475870.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/50136153161.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/48671156910.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/32938181401.pdfIn PDF document text
    • http://sdds.be/userfiles/file/nifarewubavuzebisexi.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/bamogiremililixixisam.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/27887273627.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/luzutitizopozokoluv.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/xosezedupabigetelezunazum.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/nosuxubele.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/digosatomominorobo.pdfIn PDF document text
    • http://friulanapanini.com/images/file/somimafozabuzunok.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/21676396414.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/xuribobaxapi.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1630801700.pdfIn PDF document text
    • http://standdominica.org/files/files/5856083540.pdfIn PDF document text
    • http://mfcpavpos.ru/file/90386164558.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/jabexis.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/73456163113.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/wulese.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/veruwasedinukedopawuvipax.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_off0000d515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD515 10576 bytes
SHA-256: b0c5b34e832851598d8fa0ae815da984dedc9a17b1803de7f82367de48b0abce
font_01_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 17584 bytes
SHA-256: 0febc359d1568a20280737784966f56c8ede099cfb3c4d7fdd1b6c7d284d6eb6
font_02_sfnt_off00011b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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