Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6bc3a960a78b437…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 15:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7a8aab5725ee8c8bc122e60357245c7 SHA-1: af57494095516ed0d360977e8f4f8f0d4f7318b4 SHA-256: e6bc3a960a78b4378c3e370a59a1d391e3d9fe29bec296673cc0735e2b1dbc6a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=madea+goes+to+jail+play+putlocker PDF link annotation
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/74839513049.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/87973559706.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/pipiwerulaleledig.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/29164839129.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109160219318836.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/16564324234.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/ziveragam.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/49n1b4cadnn4u8s4m56tcscf21/82816547861.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/nuverokarobivux.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/26084559215.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/38366067465.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/11889652821.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/68248387067.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/83531382243.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/79071594724.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/zasuvovetafuva.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/12836330123.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/81715197136.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d72a392bf3---nazubodabo.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/jebozijewivozafodu.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/11875959425.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/77333942562.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/telaxidu.pdfIn PDF document text
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/roregubuduguji.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_off0000bd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4D 17716 bytes
SHA-256: 46c9c697e2f731b9bf7ec2c2fce0907c87b88c491fc377ed5e34db7a2be1f113
font_01_sfnt_off0000eb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 11012 bytes
SHA-256: e56d2d24cd587475a311f8696a19c4a14f8e9afa6a6f7b28950bcd3059078685
font_02_sfnt_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1