Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5d7fc48f9a958e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 04:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56d372ba35db50be48ddcac43995c534 SHA-1: df952da280fb7eb734f43d31755ca6e0ce8a7803 SHA-256: bf5d7fc48f9a958e4b784d27f3791f238bb3935da7acc621194ed58e94fad289
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, indicating a high probability of malicious intent. The presence of embedded JavaScript and a large number of external links, many pointing to potentially disposable domains, strongly suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is likely a link farm designed to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://k-ookuma.com/js/upload/files/zenuwevitumutetajole.pdf In PDF document text
    • https://ww150001.linebot.net/upfile/files/20210925062147.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/750666362.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/45478217025.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/84127841228.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/finomokopos.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/14041749652.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/21153564277.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/sefufawesefu.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/xubobogumugazajot.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/xikowe.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/lowonoxav.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/zakesokaxuzu.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/livebigarani.pdfIn PDF document text
    • https://reniuved.it/file/nodarelowefanujiz.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/xenog.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/fafibafixovesabumatevogox.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/93846813516.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/midikedagufokegudemobajip.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/88527719905.pdfIn PDF document text
    • https://virker-ikke.dk/files/jisoxosiger.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/21755887074.pdfIn PDF document text
    • http://levotst.com/uploads/files/66143489258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=imo+hd+old+version+2018PDF 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_off0000b171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB171 16844 bytes
SHA-256: 7ed82ffb9b39481ae9317622c02b67451fe65bbbeef4e3e28cd8792cc34b77d4
font_01_sfnt_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 10772 bytes
SHA-256: fcde45f0f7d4e3b702e974150123f8e932f44bdae36e5523555984dc50d65639
font_02_sfnt_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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