Malicious PDF — malware analysis report

Static analysis result for SHA-256 02fe7b2f2cd75a92…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 20:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef8f7e33c6c41f562a36f8e2fecd6674 SHA-1: 0e49cb7709da7ef883741ca4567e539cd41f9140 SHA-256: 02fe7b2f2cd75a92b8a5042d321426540a67abe731790170478357056faca727
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score confirm malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=9th+class+math+book+pdf+free+download PDF link annotation
    • http://www.coverseg.com/uploads/ckfinder/files/93679806175.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/jozudarufufodali.pdfIn PDF document text
    • http://net-marketing.hu/images/files/powodalusazaribow.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/a1m79n2ookoeh97d7f8kopnand/13685552198.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/9646385210.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/solerix.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/17507670841.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/kopifobemebuboge.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/60750155909.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/zujuzovumat.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/xolujukuzuluxas.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/63535981255.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210922205828.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/80686357638.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/79836907486.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/76361048498.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/20052927639.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/nesebij.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/54555484272.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/sasifepaluxavewal.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/susotanese.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/sununepo.pdfIn PDF document text
    • https://viceda.com/userfiles/file/lajopi.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/lewizawiroxosufilezukuwi.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_off0000aec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DC 11184 bytes
SHA-256: ecc079e7b72731ff8fbda3c6c392f699ff1effaae369470e6cde36e263cd7c87
font_02_sfnt_off0000e0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 14856 bytes
SHA-256: 2fb3da52e568a0721b6c4d575841e9e2ad4ec656f69f74cfbff2f95535c40d76

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