Malicious PDF — malware analysis report

Static analysis result for SHA-256 375311cdce826399…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 00:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ce82bc39c7893098019655df9fa91e81 SHA-1: 0da18b56abe6f28f9f81b964ae4d27df92521ce1 SHA-256: 375311cdce826399ac5f7bde72b80e1f0acffbb7d2988364b35d5c2a39bd44cb
146 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable domains, designed to redirect users to other malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of a raw IP address in one of the URIs further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/bapunusinogorej.pdf In PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/vidogikederex.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/giwajojamupunevetuwu.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/rosabedutus.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/11022729748.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/38896134126.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/velegojemuxusedu.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210920_67101E2287466FE4.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/92187508354.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/gajetulodixomozujiwap.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/laginopukotisumov.pdfIn PDF document text
    • http://ping-property.com/user_img/files/kazogo.pdfIn PDF document text
    • https://europartner2.pl/uploads/88447152164.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/2427895102.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/49494560053.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613147947749f---28954235661.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311d38b822c---47288403352.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/0528658899.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/wexoro.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/1212096440.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/39625702565.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/menugisap.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/noxolog.pdfPDF link annotation
    • https://www.nstoplana.rs/ckfinder/userfiles/files/nedamekam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hacer+copia+de+seguridad+de+whatsapp+androidPDF 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_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 18076 bytes
SHA-256: 13648bfa6f3b69a0a22c5701c66bb9b78ae3135c52615f40f0596add09f842d6
font_01_sfnt_off0001095f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 10924 bytes
SHA-256: 493ec6786157e6ceacf27519f2f2b260f6fdb989761ac6a1a840ad382a47b46a
font_02_sfnt_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1