Malicious PDF — malware analysis report

Static analysis result for SHA-256 a348cb442f769cb3…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 03:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8014ee54512336788f05ce5e6fa9924b SHA-1: 14c4bf85787e0533416512b0e771561edfb5e218 SHA-256: a348cb442f769cb395ac043adf8a3b876f6c8430cff647c23ba7266defac0749
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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
  • 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://wastran.ru/uplcv?utm_term=pubg+korea+mod+apk PDF link annotation
    • https://drosamahetta.com/userfiles/file/25842016359.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210917_072050.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/jaxenenejurunemono.pdfIn PDF document text
    • http://jagamimpi.info/contents/files/88663405072.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/biboduloforijigegewojijam.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/42457569649.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/4707456835.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/31395296709.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/vilefaxukevifufivusoripe.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/xadewarego.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/19857969555.pdfIn PDF document text
    • http://turatabor.hu/media/77106083134.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/xalitosasuro.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/puses.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/gabenovukigupinotel.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/wijowako.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/8246118041.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/sanekaketafizaxelogu.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/91826890051.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/revomegajowajigamonukeku.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/70260934681.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/de8b8eb543649fe2b744a7a1495503de/kozamul.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142f8af24f52---mipopuvefasome.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_off0000d76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76A 20292 bytes
SHA-256: 86de72591f52608a0af4f2f0b25617223db5b5d5c9581c835ce4d04fd14050d5
font_01_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FF 10560 bytes
SHA-256: d3b8b9510846ce209c36f8b37a5f0868211dacf3a8782408b6f59ace1568febd

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