Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9f6c929f436a4d…

MALICIOUS

PDF

87.1 KB Created: 2021-09-16 14:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93c50854b6be86abcd6cf5dbe3d43f87 SHA-1: 8362824ca5f592ecd67cd5951f4c675be1a228b7 SHA-256: bf9f6c929f436a4db7900ccbe7e6664652bdccae87823c9bd008e8ee7a988da8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also hosts a large number of external links, many pointing to unknown or potentially malicious domains, suggesting a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://anm-av.de/uploads/files/55594121966.pdf In PDF document text
    • http://timandlor.com/userfiles/file/15918432087.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/wesavovoxozujuz.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/4325133906.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/36769988057.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/gewegiga.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/25921270726.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/geponukefof.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/xujojumuzefaw.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/41370520014.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/tidezupagewuxanuduxadibu.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/29811498392.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/wusif.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/pevuvu.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/monusifido.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/nisusaboxinesepid.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/30617999153.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/kujezogipagalipoxabaxej.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210902180952_1842369365.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210912000302.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/kugupiteze.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/67750271560.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/zuwusunutiludubis.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/39594174798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=id+enchant+minecraft+pePDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/fevajuvopabizis.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_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 19556 bytes
SHA-256: b20195f563fc099477dcc878feb7e93e6d5ce6b0c913d2ac00d37fbd453d1d1b
font_01_sfnt_off00011f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F62 10500 bytes
SHA-256: b8fe4fae8e2fa195917374b702179156a5f9c3012d49430e86c4554732b3b799
font_02_sfnt_off000136ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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