Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f39f398ad30bc8…

MALICIOUS

PDF

89.5 KB Created: 2021-10-17 06:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1de756d76ad4980bd5b0edd6353e03fd SHA-1: 01b97b229408834a927c24c80b2158b03c975114 SHA-256: f0f39f398ad30bc85ad99e1f057f23c777e01ec301b481a257f66b1f881dbe62
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. While no scripts were extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics. The presence of multiple unknown reputation URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://szigmetal.hu/editor_up/lomamofixunekadol.pdf In PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/60812982378.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/libiwopaxufaki.pdfIn PDF document text
    • http://philboyd.com/gidimebu.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/7486358564.pdfIn PDF document text
    • http://patroha.hu/file/gonuvemovuzasalinaxak.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210915220903.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/n2cfnq4nvpden31i43ekqh6c4t/53946369837.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/18569137838.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/66026293330.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/kuragujigivedu.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/19134966879.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/pumetunobuwavadit.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/vavaxuranujajudu.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/74338160977.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/pshvfcpbf8030u6emss3qfp8vt/derudezebakaniwagupiguj.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/pokopenoxasemaregono.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/40152633287.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/fusotowezarosidigil.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631935606.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210919025632.pdfIn PDF document text
    • http://bienbao.net/uploads/files/23403803888.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210911061219.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/79222985648.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210920234520.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/livilefozejitibova.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/HTGXzuRVGb4/uplcv?utm_term=heart+rate+for+3+month+old+babyPDF 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_off0000f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95B 17840 bytes
SHA-256: 06e5383b2350155703f41c2deddfa360288f27dfba0e3796b074e7d542464737
font_01_sfnt_off00012740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12740 10776 bytes
SHA-256: cc0aa1e1cf3430c8295122d09440480a90ceb16a027dae6684bda8855288bea7
font_02_sfnt_off00013fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1