Malicious PDF — malware analysis report

Static analysis result for SHA-256 409d4769e3ef62d9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 22:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28d387dd6becbdb2d692f3bd6321bfb4 SHA-1: 325be4f27cd8d9bd7ac111b74112bc48625a2f2b SHA-256: 409d4769e3ef62d9c72869d456106733d50a3a7db76051a99adbde2fe10639f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=how+to+download+apps+from+play+store+directly+in+sd+card
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/wimebo.pdf
    • http://www.sport-konyv.hu/userfiles/file/dopaxuvifefototopenu.pdf
    • http://jdjcnc.com/upfolder/e/files/20210910015740.pdf
    • http://oreoltour.ru/sites/default/files/file/76756003363.pdf
    • http://szentimresiklos.hu/upload/file/deduwotiwilekob.pdf
    • http://kleinschadenexperte.de/userfiles/file/nefobu.pdf
    • https://groupekineconcept.com/userfiles/file/zuwonobepakizelemuse.pdf
    • http://fasson.vip/images/editor/files/9993610552.pdf
    • http://gyarmatilovastorna.hu/userfiles/file/41841726118.pdf
    • http://abwgulfport.com/uploads/files/4892964027.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c83e01ec7f5795fbf882a8f57dad888b/50084024797.pdf
    • http://sunnysolutions.it/uploads/assets/file/50445240595.pdf
    • https://matricula.netlandschool.cl/files/12121288437.pdf
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/91403117399.pdf
    • http://clairvoyantinfotech.com/demo/images/luledebuwivez.pdf
    • https://senegal4d.com/contents/files/lozezokokilebisobe.pdf
    • http://hoaphathotel.com/luutru/files/zujolopaseromixuxiwefavu.pdf
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/lamezufimuropugusip.pdf
    • http://smolninskayahotel.com/userfiles/file/7080932348.pdf
    • https://elsadaulte.com/ckfinder/userfiles/files/92083312560.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6758461b3---lolagedabirika.pdf
    • http://gaytonfa.com/upload/files/25399271490.pdf
    • http://ng-sons.com/userfiles/file/fezigat.pdf
    • 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_off0000d77f.bin
205068fe07c7722e0b4df01e1746716bf51c63a2a40c5672a72493d9d25723e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 10972 bytes
font_01_sfnt_off0000f104.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 16792 bytes
font_02_sfnt_off00010916.bin
4c6dd4e0a3d58b0f8482ade59c24cb0ab33c2c8c1a6f1d666828839c4b431903		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10916 17432 bytes

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