Malicious PDF — malware analysis report

Static analysis result for SHA-256 5938ae39b59ec71e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 01:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 53b14049b5f2023150f677364378def4 SHA-1: a94a2e237db0fad9ffc7f001281f60c6af5f92d5 SHA-256: 5938ae39b59ec71eb8b34ae2bb606da195ef0015a4ec46547a2cb5251e841db9
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files, suggesting it is part of a link farm designed to redirect users. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to decrypt a password-protected archive, a common tactic for evading gateway security. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely phishing or malware distribution.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://xn--80aab8aioy.xn--p1ai/userfiles/file/memamuke.pdf In PDF document text
    • http://skisun.it/userfiles/files/83415005087.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/rupibuju.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/mapave.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/kigebipegazijezexamolitip.pdfIn PDF document text
    • https://cakkue.com/contents/files/pevugegixosetun.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/88745293119.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/sugasodibebidenev.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/govebu.pdfIn PDF document text
    • https://5uempat.com/contents/files/tozav.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/93662127126.pdfIn PDF document text
    • http://chikatere.com/Upload/files/guxiwufewezokaze.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/64113648715.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/3eb90d539d1fc75b8dac6b7955a3bd96/53092960930.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613372d78062b---76297865052.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/bifavoted.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/91205391648.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/tanuvofum.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/tegipewekigawitufexeg.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/51680940614.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/ladazadilojan.pdfIn PDF document text
    • https://etadelloro.it/images/file/watat.pdfIn PDF document text
    • https://totounited.com/contents/files/57126973023.pdfIn PDF document text
    • http://djapm.com/userfiles/file/kegiruzijukuwareromokujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+recover+your+itunes+passwordPDF 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_off0000d56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 17476 bytes
SHA-256: 11bfa0e8ad02aa4ab94be9ee053cc36af01e561a8e33fd3eb857fb4b73c30b2a
font_02_sfnt_off00011a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8E 10820 bytes
SHA-256: 16937b400b015f810a563c23c47168ed8e1eaf974565252783f46ef0798c7968