Malicious PDF — malware analysis report

Static analysis result for SHA-256 18680fa39442dedd…

MALICIOUS

PDF

85.2 KB Created: 2021-09-13 23:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c60ddcad56b729a7038e519a92108b2 SHA-1: 8aa2f82be860ddae8c8d19f57b1f49c355d3cb79 SHA-256: 18680fa39442dedd6b6539675150b668e42f84c6805c5f083c8917b55354b823
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a link farm designed to distribute further malicious content or conduct phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a tactic to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://baby-daycare.com/uploads/files/202109121916509000.pdf
    • https://promenade-perpignan.com/userfiles/file/nusorufuju.pdf
    • http://agrion.org/upload/fichier/famonizariganu.pdf
    • http://balade-pierry.fr/userfiles/file/demuv.pdf
    • https://dusunceokulu.net/resimler/files/gibobiguworibapegisu.pdf
    • https://unitytradefze.com/ckfinder/userfiles/files/lojeno.pdf
    • http://www.uc-kushiro.net/images/library/File/datiganigobijozajoxakegu.pdf
    • http://thepokeluau.com/uploads/files/98879939582.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/76001496628.pdf
    • http://saconsultancy.com/userfiles/file/xupapejivimogiziwe.pdf
    • http://diennuocdanang.com/uploads/image/files/99106356222.pdf
    • http://nguyenphat.com/public/default/ckeditor/files/suputodipudajagegevin.pdf
    • http://sgd42.ru/userfiles/file/nafalakisaw.pdf
    • http://hiredriver.com/uploads/assets/files/59040133039.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fffcf19734---tekipilaw.pdf
    • http://seamacros.com/upload/file/zenowirajemutasizuw.pdf
    • http://gemaeldeundobjekte.de/uploads/files/6567839612.pdf
    • http://gelateriacool.it/userfiles/files/tukuvetositat.pdf
    • http://kammatrans.com/userfiles/files/vavonev.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613300cb0b39c---guzotuku.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/93627035047.pdf
    • http://splhardware.com/UploadFile/file/2021090614251373499.pdf
    • https://primer-spb.ru/files/files/90262933463.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hide+app+root+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_off0000e942.bin
03cdcb33768dbc69ca27e51a7e8347f2459e84785ea565babf20b36e70e43e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 18212 bytes
font_01_sfnt_off0001189a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 16792 bytes
font_02_sfnt_off000130b1.bin
33a3d5c94986a223d56940039caf7e62b083a19e4c445d12dbdd49ab2a3ce4b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130B1 10152 bytes

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