Malicious PDF — malware analysis report

Static analysis result for SHA-256 9739c55b8169e065…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 06:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bd62a2cadd4fe2d3e3ee5fbb6ba3f826 SHA-1: 27fdbdd4e7d7bea67fd07fa447d0cff881fd777b SHA-256: 9739c55b8169e065f525311478b8914cc1835d5beb3a87130c52ed50dfa590fe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • 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://irlanc.ru/uplcv?utm_term=need+for+speed+no+limits+mod+apk+all+cars+unlocked PDF link annotation
    • http://hflbdq.com/uploads/file/040233316182.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/35761156567.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/5542599213.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/mupuxujiwabexil.pdfIn PDF document text
    • https://hinaweb.com/upload/file/delemofi.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/dojapuwisofezuki.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/76793053955.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/62738341542.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/20911907754.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613219eecbcdb---33291634926.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139549aee74f---gimud.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/rapibozunilipepiwoj.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/sumonuvaga.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/3567471894.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/43068052581.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/ragusotirutije.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/rifenozofavadasewivejek.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/bewodavuruzulod.pdfIn PDF document text
    • https://siroyensao.com/upload/files/xiwazawiwirosetuwikesobaf.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/bujuxukokibuzopisamemumu.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/fawevapevixomoboxewak.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/nilidisexojelavotazowute.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/29198699284.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000bb92.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBB92 17208 bytes
SHA-256: e72796dd7b38d902adf15456a0ecf824f60706adb2306481c31c23c279b4ff9c
font_01_sfnt_off0000d51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 16752 bytes
SHA-256: ce92001150166569cbea626cc26b897d5e1cbcf0fac22c2c5913b650ef5b3713
font_03_sfnt_off00011845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 10948 bytes
SHA-256: e79fe6e0fb48aba463a2bb9203a49c476fd4fbbdbc347e6413d415ecfc12e278