Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62eab372257e517…

MALICIOUS

PDF

95.2 KB Created: 2021-09-22 09:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f918baaaa9d7b518d600ff7a28d1dda SHA-1: 1901f784ee2121373a4345fc72cfb6eed387f28b SHA-256: c62eab372257e5175361f1d65772865377eb98f39d6c465df2c7069c98102386
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains or are structured to appear as file downloads. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, a common tactic for phishing or distributing malware. While no scripts were explicitly extracted, the nature of the embedded links suggests an intent to redirect users to malicious content. The ML classifier and ClamAV detection further support the malicious classification.

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 http://kondicionery-dolgoprudny.ru/upload_picture/file/29487693591.pdf In PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/75636145942.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/75396749573.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/bodalale.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/dewalewekaberupelil.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/pugebadobipuxalob.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/gujewevuxafifosus.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/xojononodilatavugali.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/98159c036142e0c226159c93f3d9f302/nuzusasimidonuvaxuwez.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/sebenegararover.pdfIn PDF document text
    • https://mklaassen.nl/images/file/kijupire.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/65432551498.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/gafajajububebakedupukuzeb.pdfIn PDF document text
    • http://ippon.lv/uploads/File/luruzap.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/kubosofogamokuxisuvepovub.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/89742792165.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/luzuwafawusopibegexuf.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/63633329053.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2a7ae95468b6197bedad1bc53713dc47/jexofaxuveguxogazajanize.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/boxapa.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/bodemumipoj.pdfIn PDF document text
    • https://labelmarket.pl/data/file/372443717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=sword+art+online+2nd+seasonPDF 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_off00010792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA9 10520 bytes
SHA-256: d0ec61f8602a8205207c4adcc2b9a93bc7e425ccf79e5a24dc8ce77af9a362d4
font_02_sfnt_off000137ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CE 21144 bytes
SHA-256: c6644759afdc2851135655d426d44dbe3f06fcc1a719a5778060d1febf63f1a6

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