Malicious PDF — malware analysis report

Static analysis result for SHA-256 63abb2e5e234dbc4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 10:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7de89a71e2f06ceff0c6887107ac9b3 SHA-1: 524da8d931d0f570b7f96fd42f0a2e4e15024dfd SHA-256: 63abb2e5e234dbc4e5bb6d535b401fa232a49649c599415f554d203b7e62c6b0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm, pointing to numerous distinct domains, likely to obscure the ultimate destination or evade detection. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely responsible for redirecting the user to a phishing or malware-hosting site.

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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef914f10d9---92282683400.pdf In PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/76913848067.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/36354368009.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/xusuzuwekomaliretu.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/wobavugavipusefigir.pdfIn PDF document text
    • https://moolans.com/uploads/files/81814329258.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/3605708080.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/nemav.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/gatuzitizas.pdfIn PDF document text
    • http://sswjeans.com/files/1371075179.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/sevadotalibigeta.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/nexaweku.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132f73ee90db---56477757536.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/xazonavufazorazu.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/63109010366.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/zukadapunu.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210903192333595.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/tesetekijeb.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/81931175530.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/39371784688.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/zufedubuludisa.pdfIn PDF document text
    • http://www.agot.pl/upload/file/fexivelifivolufofuxiz.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/1970858955.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/talepopezufa.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/mefup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=paranoid+android+coverPDF 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_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 17380 bytes
SHA-256: 22228ddbefd1c66dfc47477d0617c186aaad49143deff59ba37f9a63ee6e60ce
font_01_sfnt_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12014 10120 bytes
SHA-256: 418da0d440b4ea4a2d6c50e58899ca02ff2043b96a146472a33e295cb02e5cde