Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4ad28734fe8f9d…

MALICIOUS

PDF

69.6 KB Created: 2021-10-01 15:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b94620b26e3b196cb9af0a707fed6610 SHA-1: d4e84c3a1633feede1e99dbafc42340f6eb19b7b SHA-256: ea4ad28734fe8f9dcc166908f95b788c262c28da48983857913430e38f44c517
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by multiple engines, including ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The presence of external URIs and the classification as Pdf.Phishing.Trojan suggest the primary goal is to lead users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://ketchas.ru/uplcv?utm_term=youtube+video+downloader+app+for+android+mobile PDF link annotation
    • http://nt-module.ru/ckfinder/userfiles/files/wokelimevoxiwumak.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/76747820794.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/53332677688.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/60418377764.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/53846765865.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/90203511285.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ac97df052eba4c69419db3b657d0cd97/wuwugodavozixorikukajuxof.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/87614375645.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/fevitelemu.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16153b25c62b50---81385094158.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/dowev.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/9952579233.pdfIn PDF document text
    • https://hyper.oneewe.com/_img/files/tusugafunirorujoluzad.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-12/20210912212827708853.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/5512476203.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210907062002.pdfIn PDF document text
    • https://medtek.vn/storage/file/65848962701.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/50326467043.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/80303716124.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/83408884214.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210925075035.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_off0000b055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB055 15340 bytes
SHA-256: 8aa04f29d9b5fc7c0009d00e6fa9362ef3ddb2cc9f20d68d4d842bb98c35b0dd
font_01_sfnt_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 10864 bytes
SHA-256: 64abcad0a5958819038da34f0cef29128a4288349ce68679d5df97b1ef26cc6d

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