Malicious PDF — malware analysis report

Static analysis result for SHA-256 279d27fc00640bd7…

MALICIOUS

PDF

84.7 KB Created: 2021-09-10 03:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc87c276ea514fcee0940f1d665ed155 SHA-1: 82022c565f689cdbdb4cd316ff0dd41111f1ae4e SHA-256: 279d27fc00640bd77ecaf4187a44d575e20aadfdb205e04634835a58a063d6db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://vokalensemble-vocembalo.ch/userfiles/file/1416120743.pdf In PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/sujakutaji.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/misiwofa.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/sujidebarexejiw.pdfIn PDF document text
    • http://asid.rw/userfiles/file/jadusiwaretinumuga.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/pukibekadunonugawu.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/36521626286.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/m80dfv3828eia6ind5ulq4u58g/10878939753.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/susefovizujinusetu.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/71423704383.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/89653364349.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/zugotapevagotikito.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/67122642673.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/27910076128.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/66714899920.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/puletenokevosefez.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/36201153468.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/32640735405.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136472ab74fe---talepojoda.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/nekomabekesoma.pdfIn PDF document text
    • http://termocity.by/pics/files/kegilafevivogorepozu.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/gijozu.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/72108415347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=live+net+tv+all+channel+appsPDF 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_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 17596 bytes
SHA-256: d5b4228a7d8beeda12262ad7c360c4a5ab072738ead183dac9b44e13127b046d
font_01_sfnt_off0001167b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E92 10276 bytes
SHA-256: 58be537e930054061572ce8a208e92f940c40aaf1ad7e41e5f0758e84e7ac7c2

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