Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0870a5d1d88b7e3…

MALICIOUS

PDF

73.8 KB Created: 2021-09-12 01:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a32f2cf9051bc71cb02ddb55de4434c1 SHA-1: 9b3619734bfd37b84d329113e0ae2a92018f13dc SHA-256: a0870a5d1d88b7e3ddac280b288a20e2a83d9c091805ec26aec4d0202a5dd1df
126 Risk Score

Malware Insights

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

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, many pointing to suspicious domains, and is flagged as a link farm designed to redirect users. This suggests the primary purpose is to direct users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://grdr.org/paidel/ckfinder/userfiles/files/11602545464.pdf In PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/82944897717.pdfIn PDF document text
    • http://anpharma.net/upload/files/wixajagavogunigid.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/69183524482.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/44831690519.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/80284203109.pdfIn PDF document text
    • https://brakos.it/file/82501810974.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/risimopa.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/43082732381.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/vobavewewe.pdfIn PDF document text
    • http://spakimthi.com/upload/files/87709457213.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/tetodefuwibavovamejujopaz.pdfIn PDF document text
    • https://gilbertems.com/videos/file/gibigowajurekunipuva.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/sudikudubanakiv.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/nopimatupelunuxusuxibo.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/gabazu.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/ruwokamu.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/zexafilowitifivopozow.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/52818074373.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/zozutuwesoduvizijavowafu.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/jerepevedasuripimo.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/99610366949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=best+android+tv+apps+canadaPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/19963080852.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_off0000bf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF76 10580 bytes
SHA-256: 66a03142392a3602edca701e21ac583a49f2967e4f2350b4ba9385707c7823d9
font_01_sfnt_off0000d7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 16488 bytes
SHA-256: ba89a2b69ce90fd5e599271e3294da0ec31780af1a622b072055cde1b74adf4e