Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb82ffb541240169…

MALICIOUS

PDF

75.6 KB Created: 2021-09-24 06:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bb1b519bf2c726134a70b1e031e5304 SHA-1: 030b4487aba28beb9ae4eb4b31f42fa296b2ff6b SHA-256: cb82ffb54124016995631f15276e7147a78b166ead11165d2e8847659d656054
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a characteristic of link farms used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pixomot.ru/uplcv?utm_term=brad+mondo+haircut+for+face+shape
    • https://derfo.info/resimler/files/9118580030.pdf
    • https://madeirashopping.com/userfiles/file/dudol.pdf
    • http://bike-aholic.com/UserFiles/file/bipipubivepuzevidepa.pdf
    • https://mclandpin.com/calisma2/files/uploads/favibogabefol.pdf
    • http://ecogestval.es/userfiles/file/zaxafuzevefa.pdf
    • https://charteriraq.ir/basefile/charteriraqir/files/94755728910.pdf
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/jadoxinopezogovi.pdf
    • http://wo-kop.pl/userfiles/file/8581146061.pdf
    • http://arcadia-fitness.es/userfiles/file/tukusiwetofose.pdf
    • http://massvt.sk/editor_uploads/system/files/91974934090.pdf
    • http://japan-railpass.info/images/blog/file/mofarokaxipogim.pdf
    • http://ohmamakitchen.com/uploads/files/12747390572.pdf
    • https://lawyerupsmart.com/tempimg/file/11529882416.pdf
    • http://stardentalcare.org/userfiles/file/14777379468.pdf
    • http://angarakshaksecurity.com/userfiles/file/wasedazixotudigubisejaxal.pdf
    • http://jobsandhi.com/uploaded_files/userfiles/files/16060840124.pdf
    • https://corcreation.twbiz.me/data/fckeditor/files/20210909_214745.pdf
    • https://emmaushuis.org/pages/78139065775.pdf
    • https://securitydm.com/slicice/file/93408458775.pdf
    • https://extremedriveline.com/ckfinder/userfiles/files/rosisesinera.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_off0000bfa4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA4 16792 bytes
font_01_sfnt_off0000d7b6.bin
e43ca30b98ad8882f55065c5dbbdb103d6be3b32014ff1c0ce614b56977a4e7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B6 18068 bytes
font_02_sfnt_off00010747.bin
3e695c72c0c9500d1b4ce97c850f09b37a40990036f09bdb9b417f2f39c7b8fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 10992 bytes

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