Malicious PDF — malware analysis report

Static analysis result for SHA-256 895cb11db750fed0…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 00:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a04f75e0016d59cd58d7c86a8767a4a SHA-1: e1e5220a096065860856b76b438114f62283c86f SHA-256: 895cb11db750fed04e13c9855e8a1016bd2878e59cffc583be6927b0f97295ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=android+11+live+wallpaper
    • http://seatraderhk.com/userfiles/49701990271.pdf
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/tisomotibivagaxewikosofir.pdf
    • http://stressmanagement-karriere.de/userfiles/file/xutobax.pdf
    • https://mb-classic-service.de/userfiles/file/sipuxaletiji.pdf
    • http://centromedicoveterinarioadda.com/userfiles/files/53598757221.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/37919955107.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141400d6869b---pobojinunuwipituxivofasis.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/92bb8d2bec96a8d73ecea3346727f294/7714933941.pdf
    • http://quanhoangtsi.com/upload/quangtri/files/gusozilofomudu.pdf
    • http://www.naraihillgolf.com/admin/userfiles/file/risazub.pdf
    • https://aodaixuan.vn/app/webroot/upload/image/files/doribisi.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161424e943cb3a---molosixobufuxuxuvaxivo.pdf
    • http://snft.ro/media/file/xisilodibi.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/36544034753.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/44120842328.pdf
    • http://www.miyadenthai.com/image/upload/File/72016683152.pdf
    • https://hyosungulf.com/uploads/file/zemoguvube.pdf
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/71391633532.pdf
    • https://promaxsuspension.com/csmimage/file/vefibagat.pdf
    • https://teater77.nl/userfiles/file/defapixeno.pdf
    • http://obkladacstvikolar.com/content/19914060785.pdf
    • http://tiramisu-o.com/yamituki-n/uploads/files/juponidobadetune.pdf
    • https://duproject.com/uploadEditor/files/83096280196.pdf
    • http://evpltravel.com/xv_image/file/78758769052.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_off0000d98c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 16792 bytes
font_01_sfnt_off0000f1a3.bin
b5309d1450a6bffcd27f48007df64ff8a55d6a98dcc01fb33c10589a62952bc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 10304 bytes
font_02_sfnt_off00010901.bin
76d4e5bd6f6872fcaf2e6eed026eba42d993ef169a295a634ed3cf71a8ff9836		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 18196 bytes

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