Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f70465552aaeb7…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 14:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b4e3b532e65f55c337b03bcc7251477 SHA-1: d36d8214222222dc445f905ac8f7fe1258850031 SHA-256: 49f70465552aaeb798ec0ce983811d3b44d2a50c8b3ac132d0f6601357c95afa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm designed to distribute malware. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the numerous external URLs, many of which are hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://everbeenmagnet.com/js/upfiles/files/tazivumapevadofomafemubi.pdf
    • http://fkjz.cn/upload/files/2021/09/202109060403495455.pdf
    • http://halaljones.com/uploads/files/73396383755.pdf
    • http://cambresisemploi.fr/ckfinder/userfiles/files/16917572310.pdf
    • https://sealordhotels.com/ckfinder/userfiles/files/42509852732.pdf
    • https://manhalhealing.com/userfiles/file/29891131909.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/14824170258.pdf
    • http://stellarp.com/userfiles/file/tisubuzujerajenawopaka.pdf
    • https://sibservis.com/ckfinder/userfiles/files/48337147726.pdf
    • https://wintechindia.in/ckfinder/userfiles/files/29795989966.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf7d1cf18---60575703246.pdf
    • http://evaemlak.com/userfiles/file///36772335254.pdf
    • https://solelane.com/ckfinder/userfiles/files/zadiwupunafuxavipubozulu.pdf
    • http://vswet.ru/f/83490696717.pdf
    • https://producedepot.us/userfiles/files/63060956975.pdf
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68766662248.pdf
    • http://pn-tech.net/userData/board/file/74539902952.pdf
    • https://nomortiga.com/contents/files/63833418250.pdf
    • http://mayinmaunhat.com/upload/files/kujanafupipepig.pdf
    • http://dulwichtaxi.com/survey/userfiles/files/zobazubi.pdf
    • http://hig-hegmann.de/userfiles/file/jevojuwemofamafojubiwan.pdf
    • http://wellfoto.cz/pictures/files/75644169471.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=net+framework+3.5+windows+10+64+bit
    • 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_off0000d622.bin
51d0c87f4f3ed7515d2cd1f86a2682cf5b57eeff31b2a846c2dd505f0f67f9db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD622 17428 bytes
font_01_sfnt_off0001035b.bin
c4b355b5db8cada6a21ca029c0365c09ab72eeaac814c68c2d287808794195f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 11556 bytes
font_02_sfnt_off00011ef8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF8 16792 bytes

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