Malicious PDF — malware analysis report

Static analysis result for SHA-256 552c9e8e2a9db419…

MALICIOUS

PDF

77.6 KB Created: 2021-09-22 20:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 901481ac56fae208a7e0bbbc9b6ddd7b SHA-1: fd78a5369af63250a51d4ae37ab319235132757d SHA-256: 552c9e8e2a9db4199e4118021d0caa798e94f4698b9fb232c713b050284f119e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/vuviduziri.pdf
    • https://groupburuemas1.com/contents/files/87645294253.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161327c4f6ba70---noruvasazina.pdf
    • http://quimis.org/js/ckfinder/userfiles/files/kadanidonilixow.pdf
    • https://hunghiephuylog.com/upload/files/84251327942.pdf
    • http://medical-1669.com/userfiles/files/posugoreleduv.pdf
    • http://5percent-design-action.com/upload/users/files/jeteru.pdf
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/wisafimaso.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/43987936386.pdf
    • https://justbuymeds.net/userfiles/file/tuvuxule.pdf
    • http://szkolaprywatnaleszno.pl/userfiles/file/gelomelusubuzunegowole.pdf
    • http://monticellotownship.org/userfiles/file/dapiriwolokezuwipe.pdf
    • https://labelmarket.eu/data/file/xopiju.pdf
    • http://pasaru.com/upload/files/65876184841.pdf
    • https://stijsr.com/userfiles/file/11222161205.pdf
    • http://learnersdigest.org/userfiles/file/vivomazaviraturuga.pdf
    • http://cityfate.com/files/files/72548115647.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/guragara.pdf
    • https://pmcp-avac.com/files/upload-ckfinder/files/ziderobojijoxirag.pdf
    • http://epoxidice.ro/mm/file/detewusabaruwutuvura.pdf
    • https://ice-group.pl/userfiles/file/susot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=descriptive+words+that+begin+with+p
    • 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_off0000ce31.bin
a54592bb65ebee7481ce3cb640efb08fc1d46aef38067a8ff3c6cfa3727c2d6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE31 11040 bytes
font_01_sfnt_off0000e77b.bin
3ae57ae024e62bb5ce5cfcc0bedede73f28c2d0adbd03cfc21213e3eeb19452a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 16412 bytes
font_02_sfnt_off00011136.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 16792 bytes

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