Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c06279cae2c6fc8…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 03:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 888043d866ff526155e06260bd7ab7cd SHA-1: 28460e1f6c1792203c6a87f57521a5a51938e9c9 SHA-256: 4c06279cae2c6fc80385ba4fb5bf15ddae68ac1c8a37dbc8bddcc6b8cf74886a
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous external URLs. The PDF structure and embedded URIs suggest an attempt to lure users to potentially malicious websites, likely for phishing or further malware delivery. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate these malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://catamma.ru/uplcv?utm_term=pok%C3%A9mon+coco+full+movie+in+english+sub PDF link annotation
    • https://infiniteprospects.com/FCKeditor/file/zirawa.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/7274895065.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/pakubaf.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/72533070228.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/24825255818.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142cc5436d52---53114748655.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/wefiguvolifa.pdfIn PDF document text
    • https://curvy.tw/upload/files/2239017268.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/pubemafipumafetakivexun.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/14134247937.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/lupopolumuz.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/fupebosaxijoxobozuwu.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/68956108318.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/55113669437.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/jotonazonode.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/rosapomix.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/34276685339.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/46830211322.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406670cdfc8---zaduximovopito.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/2006759029613478fe5954a.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/dejazake.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/56449850651.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_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 10976 bytes
SHA-256: f75b53457d3fb0fc967604809832c5613552f3cb7d6d6c786b793e266fb44882
font_01_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 19296 bytes
SHA-256: be96f58657257603f79bf9fc86218651e4f45a740d4c4e58a8b28d3b55df2c1e

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