Malicious PDF — malware analysis report

Static analysis result for SHA-256 35476e64445a44c5…

MALICIOUS

PDF

74.0 KB Created: 2021-10-12 00:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 58f753ea5dae64f69154f83767f03bdb SHA-1: 373c4ae1a01395a06d485869d9482216540506bd SHA-256: 35476e64445a44c5b3099ebbb75997cb13a0e632e3526d1b73232a3124138f0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. Numerous embedded URLs point to potentially malicious domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://crewmak.ru/uplcv?utm_term=what+is+the+moon+on+snapchat PDF link annotation
    • http://elturo.ru/img/upload/files/nukuxerul.pdfIn PDF document text
    • https://fratellifurloni.it/file/zowijokozapaxabob.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/42981341410.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/wusulujizebirelenivig.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/jutafefamatelesazepupix.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/belax.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/73314673703.pdfIn PDF document text
    • https://crv.dascalita.ro/app/webroot/files/userfiles/files/fevediretulisuk.pdfIn PDF document text
    • http://modtre.com/fckeditor/editor/filemanager/img.php?file=file/bibegufadujikow.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/33138661367.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161620f5b6ad67---17550000886.pdfIn PDF document text
    • http://df-2.de/images/daten/file/xuwon.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20211006050435.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/ponixupux.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/91987664709.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/rovemezoregoxi.pdfIn PDF document text
    • https://produccion.formacion2puntocero.com/ckfinder/userfiles/files/vozuk.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/84247381007.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acbaa97e02---49971540832.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/lefilozolibezuzidi.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20211011195947566.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/48551439890.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_off0000bf77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF77 17100 bytes
SHA-256: 3da1a8070d26a86ac455c5023cbc16f0fffe083ced24846d783fe9a2656dde75
font_01_sfnt_off0000eb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB35 10488 bytes
SHA-256: aefb4fd3c58cb34f6eb8f5924e37332dc297f69bc3727daf09a5a72e3d924d72
font_02_sfnt_off000102ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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