Malicious PDF — malware analysis report

Static analysis result for SHA-256 906385ce0ce94f99…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 08:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba16c79d41ed2c858de6767de9583ad6 SHA-1: 4d873bee6619aca5642dda10102db6b675e8e38b SHA-256: 906385ce0ce94f99448f5f2da8d45564761ed317b26e69822b57e034c5433734
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URIs and is described as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it is designed to redirect users to malicious content, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=hack+wifi+wps+locked PDF link annotation
    • http://tbm-mova.by/images_from_html_editor/file/60146022064.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109110610142967.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/bavuvizedo.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/ritoguzikobanuxewiw.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/58576174799.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/59268869498.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/bojewa.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/nuvalemexiruja.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/durifadidegomegexoxar.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/83505098416.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/sedokemerulimeretasur.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/83034943667.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ce8b567d5---36201393753.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/vafuzaxunubovalusibe.pdfIn PDF document text
    • http://chemsdano.com/upload/files/vetemoxilimo.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/jisexabegiritezivaviwuma.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/41620472439.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/12613285240.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/dinonagip.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/dukubomutofatodubukawan.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/sozitikapevovavaru.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/1472654767.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_off0000de36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE36 18176 bytes
SHA-256: 623deda020ec0e9e250e73806ff208dfeb06304ccc8a63d173bad9e74f458664
font_01_sfnt_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12593 10480 bytes
SHA-256: a4945f61850ce05c0f0c0ff83ce87ac53031b5e46c4ad2f0e381902ab0624b6b

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