Malicious PDF — malware analysis report

Static analysis result for SHA-256 57780a5fed8baf6d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 06:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bdb079950e58977906b9c921cd9cbe06 SHA-1: a94226d8e7cb8354fe03687327bdb4c66f3f55d0 SHA-256: 57780a5fed8baf6d981cf8ed792a079ae2606298d889e5319927906882213e3e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=trucos+de+teclado+android PDF link annotation
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/tinakizora.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/divopebiwukifoso.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/13363297121.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/18283281451.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5bac21078d9e9ef638286774f0006f8c/turilagomosezitupasirune.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/52583365398.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/64059528473.pdfIn PDF document text
    • http://clingac.com/d/files/jademonemivudelekofagep.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/96295284086.pdfIn PDF document text
    • http://airmon.hu/images/files/86581226569.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/zaxodiwubume.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/61939958523.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/bosolowukomogupokejidi.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/rerizelejadavem.pdfIn PDF document text
    • http://autovoda.ru/upload/files/vudoxisem.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402bcaed603---girilalevaworede.pdfIn PDF document text
    • http://kotolantopeni.cz/file/juzerakanetebigerewum.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/32848603467.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/98607205451.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/75008143271.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/91606345540.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/22710641443.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_off0000e152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 10424 bytes
SHA-256: 43edd49090df3fe77ff9f5f13cdeea60b598553e4a2efbb48cee614ae90d0c0c
font_01_sfnt_off0000f90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 19144 bytes
SHA-256: 2a20ca2e9ba5f3bccf5ef8b46646f69ee08f08720362ee1397102b574af702f6
font_02_sfnt_off00012a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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