Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fe35da0388442a…

MALICIOUS

PDF

86.3 KB Created: 2021-09-17 10:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 66d5f7b64d2992f811747f1dd7f6f51e SHA-1: d7f35c6d02779bb86670aedfcbf3122c9b63a5c3 SHA-256: 75fe35da0388442a01e08e1730199d2122bf033f5bed86ebb0afd59d85e3cfd3
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, including one that appears to be a redirector to a malicious PDF. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware via a deceptive download button. The sample leverages a link farm strategy with numerous disposable domains to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=hairstyles+to+suit+my+face+app PDF link annotation
    • http://electronicaindex.nl/images/uploads/duzuvije.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/sezig.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/dozikutepu.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/86125466771.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/37380368133.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/tomaz.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/18661590035.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/sifopegigadisexenev.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613f18e5be3de---58026186596.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/54960807802.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/rabogekewaworekatiwo.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210916043033937502hy5uup19ces8.pdfIn PDF document text
    • https://ratosatu.com/contents/files/86053757799.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/juterajukuf.pdfIn PDF document text
    • https://lecachet.fr/docs/files/budakerekibibugug.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/47361704942.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/46080536641.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/58756105321.pdfIn PDF document text
    • https://blokhol.com/upload/files/wigosatasof.pdfIn PDF document text
    • https://kaparatt.com/images/File/siwewatag.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/sekunekakelavogo.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/jokitiv.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/viveromogolejatamijuju.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_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 18720 bytes
SHA-256: 2042ed70d8ddf690b17684643c0995f1915f36c0314b78f36dbd4afd37c1a068
font_01_sfnt_off00011aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAA 10740 bytes
SHA-256: a744dcc9fb84360bc5162751390993bd3eeee006dae10256f34b095ced081fb2
font_02_sfnt_off00013371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1