Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3dc9e82fc989a2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 13:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e1a9ed3f77627d2a763277e04848eef SHA-1: 07b932ed676e56396866c96777fb5c185316cecc SHA-256: 1b3dc9e82fc989a27bec72d5e0c20a3c56b5adeca079d60d75e62ccdc1dfb20e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to potentially malicious domains, suggesting it's designed to redirect users to phishing sites or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://queure.ru/uplcv?utm_term=how+to+enable+say+caller+name+in+android PDF link annotation
    • https://sopkambing.com/contents/files/75960135876.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/karubotixibe.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/37472671334.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41591907537.pdfIn PDF document text
    • https://majubesar.net/contents/files/67391260511.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/dadidi.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/38061406634.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/49763618692.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/boriporejigagujetozevimak.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/3321734997.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/26493788451.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/58917458090.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/tavozaretakaj.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/42243309494.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/78567047286.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14324423000.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/minebuxopajajibosofezu.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/06/dekudaretojosoremuwanek.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/19522850467.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/61429352551.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e92799113---90469096733.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/98848841003.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/29180819795.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/buvobujesumoxegunot.pdfIn PDF document text
    • https://lapdonline.org/file/65739115364.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_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 10864 bytes
SHA-256: d76322859d1d941b2b224d12bb0683bab5531f2810be8d03a66336b99ccc7632
font_01_sfnt_off0000eed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 18108 bytes
SHA-256: e85ab1e1873f2aa73af2d59b74d34850bf190c2dc1d3b7b6268b13b1c2219c8b
font_02_sfnt_off00011d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1