Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e43ae7507ac507…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 00:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce29b18b4348d1fc2b97479e047d2e4b SHA-1: 54a27186b538bf02e5bcfecbfa711c24826ecfd3 SHA-256: 71e43ae7507ac5070e4df1adbaa06968cfde2a49f20cb3745f10acea373230b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, with one specific PDF identified as a potential landing page. The document body is heavily obfuscated and unreadable, suggesting an attempt to conceal its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa996f3fa---67590980028.pdf In PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/59799572484.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/divinugakibuximebimonox.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/66714899920.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/61507326853.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109161618584012.pdfIn PDF document text
    • https://maymac.info/userfiles/file/25537436639.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/musuvavowavonalifol.pdfIn PDF document text
    • https://ikima.fr/uploads/file/14597327230.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/wezuvadovofiniwab.pdfIn PDF document text
    • http://youil.org/userData/board/file/bodorejajazopigabumoke.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/kijuse.pdfIn PDF document text
    • https://desco.scp.hr/files/fakebowevujimedudij.pdfIn PDF document text
    • http://belovosushi.ru/files/63642203029.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/49993527880.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/kepapowekuzulowo.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/12273076117.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/jegad.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/15149930856.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/18288784806.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/xokutalusokekipus.pdfIn PDF document text
    • https://cargotavio.ru/files/file/24665035729.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/92606350878.pdfIn PDF document text
    • http://gewald.ru/content/Files/97550640573.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/lajoxesilivawew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=redmi+note+10+in+bd+pricePDF 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_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 18416 bytes
SHA-256: 7e0cdeafb47ebba2b6d767fe622f3812d51e353cf4ba59a3ac2ec95c1dad73a6
font_01_sfnt_off0001113e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12955 10660 bytes
SHA-256: 7d99cd64099811ed962c1b5bb3560ec434461050f723290cdaaab75a3050348f

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