Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a582a4d9068ae2a…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 13:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5191c011c7c1b9c3e9072fef9215924b SHA-1: 7293d1b33528d07aed0ceaf0a12d83626c1570af SHA-256: 0a582a4d9068ae2aa96966177dba6e99872beefda6005a33ef0f56fab9c78a18
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to potentially malicious or disposable domains, indicating a link farm designed to redirect users. The presence of numerous external URIs and the 'link farm' heuristic strongly suggest an attempt to direct users to external, likely malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/22820649485.pdf In PDF document text
    • http://cocoal.com/uploads/file/budetusi.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090418273852.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/73053821433.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/kigoxerepiwataj.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/95806984071.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/15341765527.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/a69c3560869834bce571bd4915582e14/zerewig.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/6416578460.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/74147052304.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/63240266056.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d01c540727---lilekufomo.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/pitogup.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/33789189528.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109180727408867.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/20017437110.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/57323170335.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/94948911951.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/mapegufomumoxoro.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/82262029289.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/nijazitogelujabigakewure.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/faxitedesojupegudajol.pdfIn PDF document text
    • http://bancodevida.com/bancodevida/admin/images/image/file/pukonelewopewesisobigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=install+download+youtube+go+apkPDF 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_off0000b276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA88 15080 bytes
SHA-256: b3a8064687c5e0c6bd4b941bb31dfdf0ad25338815c6fc911796e06df497b7d6
font_02_sfnt_off0000f042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 10860 bytes
SHA-256: 8906573f6c7f8c234f7796768d418a182af3179b88f12834cc0b342dc04e461f