Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a4babe89d8c795…

MALICIOUS

PDF

71.7 KB Created: 2021-09-29 01:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c73b1fcad6395eb0c0dd6d01791f7854 SHA-1: 7100bd598741992eaccdf398f1ee754912b17346 SHA-256: a9a4babe89d8c7956ccc821b15ad331a0807f1012702379554ca8154b11d7bec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=recover+call+log+android PDF link annotation
    • http://fatename.com/uploads/files/202109280558039628.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/xavapa.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/bigexemok.pdfIn PDF document text
    • http://chenruichem.com/upload/files/juvixejew.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/xutevejifefopatorusuxa.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021092123545074.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/75517369118.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/nusemik.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/wixene.pdfIn PDF document text
    • http://net-work.cz/data/file/91553382081.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/xiveledakanewatemujijotez.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/gubadisabovivibalirorug.pdfIn PDF document text
    • https://vendax.ro/files/file/30115236347.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/safivuve.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16153049a6f62b---tizevuj.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/29650927673.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/77251113.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/delemageronedowozewedaj.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb70d64205---foravujo.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/jurifewoxenexaxorajij.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/vojozepegagururiduwa.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/dasemomazetetit.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/77554812653.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_off0000b2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD0 18592 bytes
SHA-256: de646b24d4ef2a4706c25e32e63525b07c3bf056db0dce160a99c5b6b27bcb95
font_02_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 10392 bytes
SHA-256: ab1ccb6954900baa00982ea15f12a0d43a7609cacc682e3f7ec39d514819b1bc

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