Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6c90f53365a522…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 19:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 149a1fff09986ae1129f744a599d6f1e SHA-1: 1ef72d36bc50638147e290edf439418d2c7b25b7 SHA-256: 9c6c90f53365a5225de1a3c6d74c32c2fb8c41fa9f88cb65b3c1f247b02f5644
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the structure and embedded links point towards a common tactic of luring users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://boschvietnam.com/files/usersfiles/files/7952365414.pdf In PDF document text
    • http://gostinica-domodedovo.ru/files/lejarola.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/91202366378.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/96667350041.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e55f7d0380---fizipavaweroras.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210905134745009502go6vraetoxya.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/61724069067.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/54273901645.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/80919583584.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109020148038214.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/padalirufiloweluge.pdfIn PDF document text
    • http://www.bash.cl/media/file/nujekorebamujimorukike.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d942de4dfb---63016169992.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631208097.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/nifavivi.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/kavapepatan.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/191501409440.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/92729001211.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/mibadunuzazenapun.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/wavebobimebijuleb.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/16401336600.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/radaxufexiligeg.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/17055202738.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/93765616484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pubg+latest+version+apk+and+obb+file+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_off0000b0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AE 17488 bytes
SHA-256: fa04dfe7f25fd90d5cd0edf7b838b66a9d38265f9757e5562a1adc57f0212656
font_01_sfnt_off0000dcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 11156 bytes
SHA-256: d4433e3090347aa66718da805517e4689d190d2d3ba3626f669fa385dbb5c515

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