Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0db8450439a915…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 21:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27733d483085a3f3a1c08c0a829ca9e0 SHA-1: ca94e847ecd26689ea323463dabf7aa980dbf0e9 SHA-256: da0db8450439a915c8cf83fe95719ed6f9076c3faf12f75d263f76d1662474f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded links, many pointing to potentially malicious domains, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and numerous URLs strongly indicate its use as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://invision.buzyhub.com/files/jexedavorizinulexetagi.pdf In PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/44286290482.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/38545640389.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/kodobunuzomafiwem.pdfIn PDF document text
    • http://belniig.by/public/file/90476917911.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a207f4a470---4333711967.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/35833852461.pdfIn PDF document text
    • https://capecoralliving.com/media/file/zidaxanerukipilopi.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/dabako.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/jitudidupuzojisa.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23884040906.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/77659973920.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/bupujowuxasuragutuz.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/35006622384.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/25090221486.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/89045022536.pdfIn PDF document text
    • http://davobio.com/upload/files/6005861927.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/kobinakuwagekobovajodumer.pdfIn PDF document text
    • http://valeneighbors.com/userimages/direbipikuluvipubew.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210917114717.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/soribetanaserisobimip.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/2o0bm7238779ka29skd2u47fun/xavivemub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=brawl+stars+mod+menuPDF 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_off0000d1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A0 10556 bytes
SHA-256: 3c6ef05688be4d7119a31eaff496ee24436451befbbc2a5cc93f878d93dbc184
font_01_sfnt_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 18792 bytes
SHA-256: eabaa8e3236704aaedf928d217852f6fca18031c2e1fdbaf0148f500c309b407

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