Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0019688c7eb67d1…

MALICIOUS

PDF

93.6 KB Created: 2021-09-11 11:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9031efd71d64cb50bf2ee97953ffa99d SHA-1: 50fdcaa2798129deb8f4aab20db86e47e718f6c8 SHA-256: b0019688c7eb67d162d91767f9de53e661c54891b534a2eab4f7ae79ca5a10f5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript (T1059.007) suggests it may execute malicious code to download additional payloads or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://quangcaowebsite.xemlaco.com/uploads/files/80453458899.pdf In PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/65444952098.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/bevataguximurufujaluku.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/13874592333.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/95087543321.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/vupodulilofavurevogolav.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/tobozijumezi.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-4/20210904112946678353.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/larero.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/barinibapozafamenezosimi.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/gitilopatidu.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/26579202983.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/98776322157.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/96499961719.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/27123552409.pdfIn PDF document text
    • http://techbis.pl/files/file/11843345654.pdfIn PDF document text
    • https://masukpt1.com/contents/files/26372053051.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/28609875376.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/0b81d775d55e38880b27f990e05ae0a6/20821698436.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/61723924071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=room+database+singleton+kotlinPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 16224 bytes
SHA-256: c26575b6e6aee893855bb34242d975175cd80c3a637213098480470b51344c49
font_02_sfnt_off0001150b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150B 10768 bytes
SHA-256: f0869c37fcc58d20a950e7e7063f1a3d68ba3c3401215df665064898697541e6
font_03_sfnt_off00012d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9B 22868 bytes
SHA-256: daf695d93adacee4c5dce3d16f9baa48d464f621367f2983cd669b9f3a5e59fc