Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc722ea4d133fdd…

MALICIOUS

PDF

95.3 KB Created: 2021-10-09 23:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8264fe591d49fb5abca2997a6e17af14 SHA-1: 926fcb3cd91945908330836c69c83da5328add04 SHA-256: 4cc722ea4d133fdda312e6a9257bf0fe65f0c0aff60295837ebe1cf086380acc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic reveals a large number of links pointing to various domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://francemonde.news/UserFiles/file/60817906525.pdf In PDF document text
    • http://namjapizza.com/app/webroot/files/97953728162.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/92115408906.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/kekojufinepi.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/9602932332.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/73805932050.pdfIn PDF document text
    • https://agt.twwebmarket.com/ckfinder/userfiles/files/gusexokajezosepevineduzer.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/50535345205.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/17471256148.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/23426772925.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/pirejezazexewaba.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/18985035010.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/11087391189.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/edba8b634f499aa8e8f28a66d2fcabe0/50017653566.pdfIn PDF document text
    • http://gist.adrianlechowicz.pl/userfiles/file/4982289711.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/tekokuzorixak.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/28442357626.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/86320358305.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/59562555355.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1534378123615c6ae508f13.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/wewor.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/52952061513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=boy+names+starting+with+sPDF 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_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 20996 bytes
SHA-256: 7eda4de18290fde3e16895bc8cb2878c42d8b668d3f4fe76e872f427b6ffec08
font_01_sfnt_off00013e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001569e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1569E 10764 bytes
SHA-256: 849f2420aeda15af0ff88db6d2bdf68516e68a7c96b55b00bebf98e89cf3dd0f

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