Malicious PDF — malware analysis report

Static analysis result for SHA-256 036f5e8774327b6e…

MALICIOUS

PDF

91.3 KB Created: 2021-09-09 02:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14296856ac1840a8c3b17e189b778c7f SHA-1: 2a1bb1d925d4f22a7f9933e5d674a4fd0feafcb6 SHA-256: 036f5e8774327b6ec7adda812d64b2e06787773746c36626943086aa8fa5672c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://huntic.ru/uplcv?utm_term=is+it+possible+to+hack+android+camera PDF link annotation
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/jebodul.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/17471478267.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/82651709881.pdfIn PDF document text
    • http://chayka-svg.ru/files/losafozidavoje.pdfIn PDF document text
    • https://led7.ru/file/27569725361.pdfIn PDF document text
    • http://rnralpha.cz/res/file/megupofenabe.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/38175656850.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/xuvupamigosesirera.pdfIn PDF document text
    • http://lgassociates.in/uploads/93919072354.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/zivarujarirabatobawowob.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/35552357652.pdfIn PDF document text
    • http://hmed.vn/upload/files/12986059384.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/denakekokor.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/24570306482.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/36004185390.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/gafowexizebiwizedeli.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/mudameku.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/tumotokakip.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/30443570783.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/kewazejegufatupeleti.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/2766518781.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/71065197465.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/tiwisadelebeko.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91553022310.pdfIn PDF document text
    • https://curvy.tw/upload/files/23985945520.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_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 17740 bytes
SHA-256: 9df721d8807ace43d5d09ae1d2c10c086f43d921ad9f73c83664e811af4a1983
font_01_sfnt_off00012e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1E 10960 bytes
SHA-256: 1ed16ea17e65be4d88afa10a97c29aadb2975074025f7e52d5a63d897fe0e8c2
font_02_sfnt_off0001471c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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