Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7208a7e24ba7777…

MALICIOUS

PDF

69.0 KB Created: 2021-09-23 08:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d7d430a0a4e1fe4a53945d5212fb7ec3 SHA-1: a75ad294f6c813be1c4c95f7642eac6a7ba2d1f0 SHA-256: c7208a7e24ba7777b19a46929fd5419fe91b31152f698d0c2318993506c17da6
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 distribution through these external links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=speed+post+from+canada+to+india PDF link annotation
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/labigawotowisowuxekeviji.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/supavunadaduwodurajiv.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/31196009590.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133821273748---1100969182.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/wugatonitapelogakojivodak.pdfIn PDF document text
    • http://xycrusher.com/d/files/41304767687.pdfIn PDF document text
    • https://icbacademy.com/upload/files/rarumuwaf.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/45703945966.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/55481915905.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/xazoberufajopadi.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/43803508182.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/vekewivofumotipibomadu.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/51033210764.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/15897113892.pdfIn PDF document text
    • http://ud2-140.com/files/dazitigumus.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/femelafexakelus.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210911172312.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/u9gb8pdk62brfann5pvmidkih8/14060779330.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/duvirupotefavopezog.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/89188210090.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/48234815614.pdfIn PDF document text
    • https://henuopack.com/d/files/58536816678.pdfIn PDF document text
    • http://geose.ru/userfiles/file/66392632341.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/pazuxirezigoxi.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_off0000b073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC885 15124 bytes
SHA-256: 502649490e27f121968a00a3a24f3629a02d193f7c2d8d7789a96206998f30f6
font_02_sfnt_off0000edb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 10812 bytes
SHA-256: f11b26cc0f78af23de60d7ca38908b3c15e027be76c664167ee0154ed1373072