Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fe7a528a6bc5c4…

MALICIOUS

PDF

83.1 KB Created: 2021-09-21 07:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11d166ed085e09480a2ef6fbe2592d21 SHA-1: 636f3c78bfe307578f0f28fb9333661cc329d401 SHA-256: d5fe7a528a6bc5c430dc41c89003a589a36d4325477631b860242d35a36f8301
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm designed to redirect users. The presence of external URIs and the 'link farm' heuristic strongly suggest an attempt to lure users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zzquansu.cn/d/files/mulidetatujomero.pdf
    • http://leaguengn.com/userfiles/file///17930560190.pdf
    • http://friulanapanini.com/images/file/vexevuzes.pdf
    • http://mebel-moscow.com/content/xuploadimages/file/10069689821.pdf
    • http://iphysiology.ru/upload/fejopafesalaramev.pdf
    • http://sabaispa.net/userfiles/file/jusisugabafebonarukiz.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e58f02d56d---vekoberutileb.pdf
    • http://yuhao-tech.com/userfiles/file/dulafozejikubawudos.pdf
    • http://cleangroupbd.com/ck/upload/files/78185719881.pdf
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/tubawefeporufanitivote.pdf
    • https://dynasty888.com/image/files/20210920_140039.pdf
    • https://tavio.ru/files/file/82622532019.pdf
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/viluw.pdf
    • https://hoatuoi360.vn/uploads/files/34901892879.pdf
    • http://villalapinetafavignana.it/userfiles/files/81061467614.pdf
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/65842109560.pdf
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/7113799928.pdf
    • https://digitaldaya.com/imagenes/file/34197987090.pdf
    • http://fornacedelia.it/userfiles/files/dozavatusewetasimol.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9041b9fa6---jilesuneb.pdf
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/23262247515.pdf
    • http://allprintusa.com/admin/images/file/favikopunu.pdf
    • http://sibinetweek.ru/userfiles/file/99785017522.pdf
    • https://altinhediyeler.com/calisma2/files/uploads/dusizikujipokugoxob.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=backstab+mod+apk
    • 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_off0000df7c.bin
51fde35a202888b9aa7588f1902163516f36d609848cccdb26ee862191e40ebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 18344 bytes
font_01_sfnt_off00010f29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 16792 bytes
font_02_sfnt_off00012740.bin
c3c186c55c61f416f8770edc43c1f2dcb4d5ed09e6c08c0c9d0ef1cbae41f88a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12740 10484 bytes

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