Malicious PDF — malware analysis report

Static analysis result for SHA-256 242c67af79b8aea4…

MALICIOUS

PDF

69.0 KB Created: 2021-09-30 19:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb9e35cd04df461dad9465a66910439c SHA-1: 029aa88d1660b525b7fa437ac9b470bf1f1d2c0e SHA-256: 242c67af79b8aea4335b071c0959ebb01363eb50eb729281c2062bc0d3ca96ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/f0c135cda56b5ccd13680439b6a8fe2a/59780153062.pdf In PDF document text
    • http://voijin.com/userfiles/files/sixowu.pdfIn PDF document text
    • http://apvn.info/userfiles/file/rubobotarewekosumebavu.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/wedilaripozuvoseja.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/66939119627.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/dusufasasipize.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/jovosipozi.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/0f87bd6ae652e30970621ec0e0fad558/87685512451.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/dovula.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/deruxafubuligebaju.pdfIn PDF document text
    • http://htygroup.com/upload/files/55697027936.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/60338744370.pdfIn PDF document text
    • https://fobh.net/userfiles/files/potikide.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-01-09-56-50-ng5KZkL5.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/xokanarivuxajezuk.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/taxededokeposowa.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/81632498166.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/6994857608.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/56193310790.pdfIn PDF document text
    • https://edusfera.pl/upload/file/3856520413.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/85475289262.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/xinumij.pdfIn PDF document text
    • http://bckvalumni.org/userfiles/file/63783465071.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/gidekodo.pdfIn PDF document text
    • http://dfanchem.com/upload/files/mubiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=abrogate+in+a+sentencePDF link annotation
    • 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_off0000b041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB041 10480 bytes
SHA-256: f358e12bdcd7ad6b63bafaa92f0d1e1b484128737571855d5f03f3235a8fd70f
font_01_sfnt_off0000c844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC844 15160 bytes
SHA-256: 501332b40b4ca30aecaf62bcca59f21453a52efea51f9d7c029c051cd5dc4ba2
font_02_sfnt_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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