Malicious PDF — malware analysis report

Static analysis result for SHA-256 958bc942f1101c91…

MALICIOUS

PDF

63.6 KB Created: 2021-09-20 00:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e0a6b87d40f5e42befe8f6b99c056f7b SHA-1: c02bfd0e30b94b72882982b2d0e1ead11e2408c6 SHA-256: 958bc942f1101c916407d0ca49571ee502afc2d83713c56c548cdc2c649a4bb3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URIs that likely lead to malicious content or phishing sites. The presence of many distinct hosts and UTM parameters suggests an attempt to obscure the ultimate destination and track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://krisoc.ru/uplcv?utm_term=file+cbz+in+pdf PDF link annotation
    • http://xn--e42bt3l.net/upfile/files/bipifedojonevorarabevofev.pdfIn PDF document text
    • http://knipia.com/userfiles/file/zapozumag.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/kurofawut.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/wenebikumutume.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/lemalavidaporogikakuvifi.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/parotizigosogofadon.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/subuxipataketof.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145319e9da53---piguwaposovu.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/52033622575.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/wizofogezetinikutogawifob.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/zovuzulopedi.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/dirijorinumaliva.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/82131318945.pdfIn PDF document text
    • https://jss-moms.si/upload/File/rinuwifusuvugabipumezo.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/49333728955.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/rizewimofawatujazak.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/12317981590.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/zutedosalut.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/mubapufibabogarofopobijo.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/vozadazabezejotet.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/katitavederizizenutakewo.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/3770473524.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/xoxutoluwikunujox.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53B 10140 bytes
SHA-256: 541ba31ddecf8806af27ccc8ac84daa7143a92590511ed7bfb05c914d0664b3f

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