Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eba0fda32d31ebd…

MALICIOUS

PDF

68.4 KB Created: 2021-09-30 15:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed2e222668a14cae542f1a8f17494401 SHA-1: e0d9aee2baa99d2e460f0b13faffbce99af22b64 SHA-256: 4eba0fda32d31ebd1f1727138d0eb0ba8b6545f79d59218723f4379fa188fd98
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wsm.hk/images/uploadfiles/file/13278112482.pdf
    • http://precisao.net/files/files/lalekexidufos.pdf
    • http://eatatrudy.com/uploads/files/lazopefafebenolofutekiza.pdf
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/viteso.pdf
    • http://hoangduy.vn/vn/files/22561274764.pdf
    • http://zdravi-kromeriz.cz/files/file/nixupobuluvadokoju.pdf
    • http://dar-tom.pl/userfiles/file/pixabi.pdf
    • https://windfreeklima.com/upload/ckfinder/files/87409107248.pdf
    • http://ficfart.org/userfiles/file/lugejo.pdf
    • http://sangsangins.com/upload/upload/file/jaridepufuge.pdf
    • https://dd-inside.de/userfile/file/zevunipujumumovosizobake.pdf
    • http://henskeschildersbedrijf.nl/upload/10960525936.pdf
    • https://natyabio.com/uploadfiles/jezal.pdf
    • http://gardena.crazyrockinsushi.com/uploads/files/69812184962.pdf
    • http://studiolaviano.it/userfiles/files/lupediwodexajitob.pdf
    • https://bednidhitraders.com/userfiles/file/xomipaxegamebeb.pdf
    • http://w3-japan.com/js/upload/files/tasor.pdf
    • https://intersat.lv/files/file/kizibufunezek.pdf
    • https://kmedebiyatgunleri.com/ckfinder/userfiles/files/xipijelubojaka.pdf
    • https://www.assofmt.org/ckfinder/userfiles/files/38390171452.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614084e5b8394---bokewub.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/9395092590.pdf
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/47455316154.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=lcars+android+wear
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad29.bin
ac3f63dc3d5c0470da08008326784174ad3665541cfe9891725d79909922eeb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD29 15604 bytes
font_01_sfnt_off0000d4ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 16792 bytes
font_02_sfnt_off0000ecc3.bin
43758d1303ec141736e5dd3078232c1ed0265ae82e16476449f99cb52161a386		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 10260 bytes

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