Malicious PDF — malware analysis report

Static analysis result for SHA-256 347e3d98b7f4a802…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 09:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ce9e3dc4250799856332656cd74bf794 SHA-1: 1f5f0dc879e583e030ca55dbf6cb654607826fe1 SHA-256: 347e3d98b7f4a802184be8f529e9fc5e56498e086ccfe2374229e8976b4403ca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, with one heuristic specifically flagging it as a link farm on disposable hosting. This suggests the PDF's primary function is to redirect users to a network of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://lovesushiscv.com/uploads/files/zanajemume.pdf In PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210907135337.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/14911544373.pdfIn PDF document text
    • https://steammining.com/userfiles/file/31112589925.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/pirure.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/wonumezefos.pdfIn PDF document text
    • http://vitrine-prof.com/files/xabujopewutasola.pdfIn PDF document text
    • http://client.diffuse.info/files/99877207497.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac0cf015a---43121707796.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/jinoruremuwakuvinak.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/9651318903.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/pakanow.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/dulejonopejanejidemijon.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/vimudemuwuvexaruxopilo.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/vudum.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/93435840472.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/ganigepoxad.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/56893903923.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/wujavad.pdfIn PDF document text
    • https://digireg.cz/upload/94590476903.pdfIn PDF document text
    • http://dytac.hk/userfiles/65405906653.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/nefadogemofekomizanizusom.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/86517071593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=boiling+point+of+rubberPDF 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_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 16884 bytes
SHA-256: acf569d377086cafe0df85dc74d02c24c6d9ae65ae4ae18928215be1b80f196c
font_01_sfnt_off00010d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2E 10496 bytes
SHA-256: 8b6fe53e5bc0b60720e7f7031948e0c97f9e5fee9e30131d4d476f4ad2bd0774
font_02_sfnt_off000124ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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