Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7e1b4d48a868db…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 11:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3276805286bb0da0b2e44e597ea3b521 SHA-1: dd9d18750e5715423503fabc17c35e744ec1ae31 SHA-256: fe7e1b4d48a868dba0dcfe7a32a5ea7da14999bae09c3caa8f70de31ed90fc42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, many of which are unknown or potentially malicious. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://nanouklid.cz/upload/file/31162937443.pdf In PDF document text
    • http://gonvvama.net/filespath/files/20210902113332.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/29598899932.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/75057903078.pdfIn PDF document text
    • http://totoumi.jp/upload/file/30810635713.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/8336774662.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210909054915.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/43016463527.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/gixenifakalexexesuxagiw.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/xotobaribazerarexexeva.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/kolusabuzefowizov.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/menemuxukibotowe.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613194a45a068---nevukimupimanokekif.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/sadekuwefopefotunulidami.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/131373156.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/14449156645.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/vazexiliginejodo.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/233347329.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/efe72e8bc201384789271417527958f1/36216489306.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210916_B9601714421EC476.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109080648215969.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/81036392746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=europe+mingle+mod+apkPDF 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_off0000cf7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7A 10644 bytes
SHA-256: 94de983e0ea2bb2265cbbf69476fda85ea6a7f05cba69d08f35debde1f7eb10a
font_01_sfnt_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 18312 bytes
SHA-256: a8ff1fc85946f1cf91f6aaccca5adbaa6983b3e3638857608b52fba89143092b

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