Malicious PDF — malware analysis report

Static analysis result for SHA-256 9990bd941684868d…

MALICIOUS

PDF

97.3 KB Created: 2021-09-20 11:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e2db7dfee6ba21f1b6697b24141fb14 SHA-1: d3fbe129fc93d2c7d4886e06b47d6146de29c7e9 SHA-256: 9990bd941684868d4ac1559155f6707ab0cad5727c604cde41fdd453b4dfa8d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://greenfins-thailand.org/uploads/file/91730717436.pdf In PDF document text
    • https://dennismaloney.ca/upload/editor/file/keluzuratokogimagalupan.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140cecac7d1d---lagit.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///jagumeguxeluse.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/zonunakusevoligug.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/68362593323.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/27875169688.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/67050357521.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/61381273cd56a.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/zigutux.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/77139471870.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/xaxojonojuminojironax.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/fovobifipebusazew.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409e25685a4---lijadavijagudifef.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/nelepopitilofexojurawov.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/96249711229.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://sl-light.ru/design/img/upload/file/kuxitakexoj.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/18619170098.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/4469003753.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/solizazipodamenituleg.pdfIn PDF document text
    • http://vaithun.net/upload/files/lunofok.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/jakevetekez.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/xuxoraziputululum.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/74955526864.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/40415003106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=nds+roms+for+r4PDF 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_off000117df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 18884 bytes
SHA-256: 281e95013ac95f6094a4e5751bbc36bdeaf9d5d8d180c5e037e665820e8dd005
font_01_sfnt_off00014972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14972 9936 bytes
SHA-256: d64d368a28394ef4c71052d2b185fbc1f45c94b63792778cd700ba9c1ee0287a
font_02_sfnt_off00015f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1