Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd15e43d3edc3c0…

MALICIOUS

PDF

70.8 KB Created: 2021-10-07 16:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ff4c15b6927cb17caa335aba15ee8823 SHA-1: a6661655855e2799ac4f4ccf6646101ae0db812f SHA-256: bdd15e43d3edc3c0fbbd25b787f7b9799652a559cb64f7af052b9754ca6cfcae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs suggests an attempt to redirect the user to malicious sites or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed553a3fcf---40586260803.pdf In PDF document text
    • https://terracell.pt/images/file/firerikurixodajoreb.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/zamurofawigix.pdfIn PDF document text
    • http://investkwik.com/userfiles/file/9056438868.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/duvufawiguboraloj.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/52255664611.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/radit.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/zeteronad.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/wiselugebo.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/diburoxozisegubori.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/razugenogep.pdfIn PDF document text
    • http://belovosushi.ru/files/negogoto.pdfIn PDF document text
    • https://tsolisp.com/files/file/70911861667.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/mofugipugevapivovi.pdfIn PDF document text
    • http://wsm.hk/images/files/loremelenuvuzixedajepobi.pdfIn PDF document text
    • http://noithatvietsky.net/media/ftp/file/97116724893.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/97842673883.pdfIn PDF document text
    • https://labelmarket.pl/data/file/lafomikuranivaloju.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/suxabu.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/10009176883.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/62358919737.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/ziwen.pdfIn PDF document text
    • https://wittnebel.dk/file/96053815980.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/45375242778.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/10143689087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=indian+contract+act+1872+pdf+free+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_off0000b4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E8 15244 bytes
SHA-256: 45e8972d585813d64361c54df5aa2404cf5a33df4d819d90f225eb59c00121a7
font_01_sfnt_off0000dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 10912 bytes
SHA-256: 2c49335eee036ec9d99e8e026ecc45a61f23cf826bfd1e4ded6fab39e30f88de
font_02_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1