Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c33b5aa5a483db…

MALICIOUS

PDF

78.9 KB Created: 2021-09-09 17:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 4a8530192dba4952430d41cf7fbcbd22 SHA-1: cc440ceef84f4c10509754819bcabc2b38d49234 SHA-256: 20c33b5aa5a483dbf023fe465bbc81c54bbd7ca71fab791b71b1425a208fe457
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://balone.net/_upload/file///godirejorarizufututon.pdf In PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/86695287739.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/bubuwerebetojunovemuj.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9d69405a2---bokukimedipawafibe.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cd1b6d36---kubafadupo.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/38387531477.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/wugobefaziwepixas.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/diganedabobiv.pdfIn PDF document text
    • http://crm333.com/documentos/file/ropipadedezozar.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/tatino.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/5083938528.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/24316800657.pdfIn PDF document text
    • http://edallyshop.com/upload/files/pudegabutozuwiboxulowek.pdfIn PDF document text
    • http://cx-gl.hu/images/files/jipajefinomokisububavare.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/85078272749.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/dufeganep.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109080223464828.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/76820115199.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/65280304381.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/fevibewuju.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/wofewojapejalos.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/46a0fc7fa38e85c0bc719b12d03490c1/10567383619.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/37133162860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+download+coc+modPDF link annotation
    • 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_off0000d34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 10116 bytes
SHA-256: 0cff6eb4461cabf4d0601db876cd7fd82116f5efc92eb8480113705c8476e0e3
font_02_sfnt_off000101f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F1 17280 bytes
SHA-256: 142d0895de82b1b8e5e0d6095fbd6cade615427e069ee2a0acbeaf3b1a3a4594

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