Malicious PDF — malware analysis report

Static analysis result for SHA-256 23895c91e2c2b1ff…

MALICIOUS

PDF

78.6 KB Created: 2021-09-24 01:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed31f867bd29a3263218d289081d140f SHA-1: f6111945ab0f55983f5caea0a1682252b4c6b3cc SHA-256: 23895c91e2c2b1ff119806a99f777933d988c2253bc86384d0ab6aa38802b9c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external sites, with one specifically identified as part of a link farm on disposable hosting. The PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=imei+degistirme+android PDF link annotation
    • https://regaluxiluminacion.com/uploads/assets/file/33924140951.pdfIn PDF document text
    • https://activepymes.com/pub/file/72761572675.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/nexokukatariwel.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/lubidenedemapeka.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/68193927287.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/22735144442.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/pipadegavudupitin.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/wafetamalakovokasozap.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/14377084710.pdfIn PDF document text
    • http://eventechsite.com/files/files/naguzogisaroxawawejivaz.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/85490972127.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/54434308846.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/xisosasepiparotifivo.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/29021781557.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/lepojadudise.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/91282087815.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/84693691882.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/fufevimubazikagomepusas.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/96093355473.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/besipis.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/pasesewuxa.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/96131628020.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///sapesodadunexibipogofud.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/fumelitobabu.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_off0000cfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 18492 bytes
SHA-256: 2fe585990425fe0f90b7780dab8c641211310aeb32fb7978aac174697c958197
font_02_sfnt_off00011590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11590 10496 bytes
SHA-256: 4d727a4b6430251ff48df0001bb4d2982de3da61e7fce2e03ca148d45fe5a0c6

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