Malicious PDF — malware analysis report

Static analysis result for SHA-256 70db4a4f73b4f22d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 11:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1aee131e6869725946a04a1bd1cc36bf SHA-1: 8def12b395b062b952746b90768dc70c7a75c9af SHA-256: 70db4a4f73b4f22deebd845d5292e68dce24ad795d09fd012d318740b7d61479
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is identified as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=image+tool+apk PDF link annotation
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/xazabafimuzawinimisuv.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/xamajixakufuvinenimagu.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/vefujunefigobanejujebuv.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/povelonudifadaxurebowanos.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/polumojiwajaxug.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/rumitufotojajo.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/4129908265.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/kotuvamelaxasega.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/mojufinetakudote.pdfIn PDF document text
    • http://paliukenas.lt/i/File/84068031087.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/jekozupopopiloruviza.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/4714806755.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/gabagolasunal.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/guwosib.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/65533399905.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/visebobivizufe.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/ruloluzulow.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/kibilufiseles.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/8701831811.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/23b99a383a92c247177183f8b41bcd37/wunilavogegopulawa.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece7308dc3---37258597487.pdfIn PDF document text
    • https://betsin.org/userfiles/files/77261592616.pdfIn PDF document text
    • http://blueparadise.pl/userfiles/file/lilop.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/78235761608.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_off0000da96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 10176 bytes
SHA-256: ad9be0e6acd48abf69699954a5bde062b55c27b5ae4e406c6c8119c50b2a1442
font_02_sfnt_off0001097c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097C 17476 bytes
SHA-256: a8d05490399957cc3a45cdd66ec8495f4e1b782b8c6a36f849780ab45f6d31ff