Malicious PDF — malware analysis report

Static analysis result for SHA-256 6909e04e062fd114…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 10:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b4f625dbe7db790e44f6305a28108e0a SHA-1: 365c42e87d601024fee169ec676413d63b886dc6 SHA-256: 6909e04e062fd1143c64fe16c9035491be96d1b208dc4f8021bc9aa32e7f448d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=piano+tiles+2+apk+full PDF link annotation
    • http://upnbkk.com/file_media/file_image/file/52311314995.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/rexeminunesuzezakirol.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/jufedojukozuraped.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/xaxafokogamuzokapimobiw.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/julemokupukeve.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/kolelozati.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/zenosupimit.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/rikekonufazudib.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/43436807986.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/livupozivileku.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/97513709757.pdfIn PDF document text
    • https://emmaushuis.org/pages/61413344004.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/kotezikex.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b0186f22---sudadifinagudekavufev.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-12/20210912161558631952.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1985_20210914112036.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd027846b---95225584867.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/pefizineketonezawijoliwo.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/lubodovizabasuw.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/jaxotodivumuxigowuz.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/96113763675.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/kifefemawifavove.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/53033900822.pdfIn PDF document text
    • https://emenu.hu/editor_up/xiwid.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/totifanezejo.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_off0000d951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 10564 bytes
SHA-256: 4ff304a3f631d963a8efe359ebc7872a5e9d479cbd7e8357b71535bbfb74da75
font_02_sfnt_off000109bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 17828 bytes
SHA-256: 7e69c3002aa9d5348fa1388dc858b2ebc77e95832488bd1b732196045f955a1c

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