Malicious PDF — malware analysis report

Static analysis result for SHA-256 418b814b85fc0c3d…

MALICIOUS

PDF

70.9 KB Created: 2021-09-08 22:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c9b7d3e93f287f42e5a8e79da779649f SHA-1: 3e62f84f07ee397ff5530eceb16253641c61a2d1 SHA-256: 418b814b85fc0c3d45044e88991f4fc1f60538c37e22e9ce1e6582f0f52660e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links, many of which are to disposable domains or raw IP addresses, suggesting a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • 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.
  • 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://magyar-logyogyasz.hu/fileok/file/29642878266.pdf In PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/94470745066.pdfIn PDF document text
    • https://scalper.ir/data/files/file/68682299755.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/luvabixuwagofige.pdfIn PDF document text
    • http://www.polni.si/Images/files/11843496374.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/xaludu.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/jajitewatasenolatarezot.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/89496251470.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/gipuxofi.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/75496751275.pdfIn PDF document text
    • http://tyextractor.com/d/files/6895819822.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/tupejo.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/lupofewikomivogexuga.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109021104253734.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135759b7e5dc---ludaselijek.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dda3c16bc---juzafidemerawusagitava.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/83455100859.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/wokam.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/dumibavigunadivuzewotob.pdfPDF link annotation
    • http://prochem.vn/images/uploads/files/gizowadikufesak.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/14158814682.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210902234852.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/tavelubenivaguzukakigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=starmaker+mp3+song+downloadPDF 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_off0000b3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A0 15780 bytes
SHA-256: fe2310d3c6e877a5f02f41b3a55150007d11eac25750da7d63685b00dcbe0aef
font_01_sfnt_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 11068 bytes
SHA-256: f19258fb198719a15d8ce23a1e96148f670e9960399f8606668b125496c12d06
font_02_sfnt_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1