Malicious PDF — malware analysis report

Static analysis result for SHA-256 6673a205b54a86ea…

MALICIOUS

PDF

77.4 KB Created: 2021-09-14 08:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 96da6537732bdc247dd1f7559a42d93b SHA-1: ec86a40a7633237b532380e8df0feabb315c4808 SHA-256: 6673a205b54a86ea364e60c93e5eb6054c186c9136d7bff742615d25fda32cce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=add+map+android+studio PDF link annotation
    • http://bixenony.com/userfiles/files/54354101065.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/66971551530.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/batiluveleworojezuletufon.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/fabikududogananoludosarap.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-5/20210905100413519631.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/xewifewijoku.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210905021025.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/bimolegokanef.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/38165909669.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/nipowivasepasafufiv.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/47916326611.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109022059076793.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/gukezuwurewinoze.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/vorolewatalafagologafe.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/83226591098.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/nodenifelosuputuwumatafaw.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/didaxeja.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/xameremanozuledu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed1ef64d47---31632143264.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/69662287651.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/40242600232.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/97168392500.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/57609901762.pdfIn PDF document text
    • http://tiquital.com/documentos/file/68175630171.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_off0000c2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 10456 bytes
SHA-256: bdf0f446195363f4a09bd636899f919dad95e92c0bfd391ced4f96a92b051487
font_02_sfnt_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 20980 bytes
SHA-256: 475b59e9611c113459a3f41ed3fff3cab6b99eff4ce5ddba7d893a039610bf4f

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