Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7d7b3c7f69d290…

MALICIOUS

PDF

85.5 KB Created: 2021-09-23 05:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6d6b91c6c9918623e3f3bacce976799 SHA-1: fc2d83027b57cf965ac9e5a60fe8bced580a7bf3 SHA-256: 4a7d7b3c7f69d29058d568479f427163ea1e91d13b2166232b66529b2198b085
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a specific ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm designed to lure users to potentially malicious or phishing websites. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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=can+you+download+steam+games+on+android PDF link annotation
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20004262740.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/97412090047.pdfIn PDF document text
    • https://partetesal.ir/data/file/33150343340.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/dasezudofu.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/65796930398.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/17298050017.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/20571905616.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/50694426013.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091607154772.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/1d5b086e1d9bca85801bfba584ff6ce0/32741099191.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/53022494431.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/62278040345.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba7a54c0d4---9285532924.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/32253066473.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/tomiwijisojakomujibivetif.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/98461800823.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/52438974685.pdfIn PDF document text
    • http://gardatrans.com/content/Files/28800072168.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/pofufuso.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492794dc744---wurosidike.pdfIn PDF document text
    • https://polaria.cz/images/file/8465767127.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/vetivulufilepe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 10924 bytes
SHA-256: 63756c45efe6dc1e526577d0d1568ae0664617f0ce29b21ea3eaaadb500d8db9
font_01_sfnt_off000102f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 17680 bytes
SHA-256: efdbb6f6f51b7d75f91ef0725a5d9fa365fdf4fd89537f4a0ec7e6e84f911249
font_02_sfnt_off00013093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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