Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b30047e6776509…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 03:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ffc3c71b36282fc05772efe14547fc4 SHA-1: 1469e046644087e698fdc8aa2ca7ed1cde73d4b0 SHA-256: 48b30047e677650949d100c9ba8015a0b8c85258961c8bb316e4ad5028c1768a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lubrifianti-auto.ro/files/file/zekuko.pdf In PDF document text
    • https://awinresource.com/uploadfile/file/xinosafaga.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/wifuvimasabijekupukuxojo.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/99428893371.pdfIn PDF document text
    • http://ladna.pl/user_images/file/nomilodopajetusowinuz.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/19735218449.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/zevawu.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/20937777151.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/bovenuvexim.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/kufijitesolepozo.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/kejefota.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/lazetoxijo.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/69608311080.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/sinebevitowupiworojib.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/12984262202.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/pigusekozof.pdfIn PDF document text
    • http://llux.vn/uploads/files/kawelubamegamevafiwopolap.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/boxirabujosatulabenogojer.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/68735673782.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/10070735500.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613175ff33114---sofanabawixatowoner.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/6790808644.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/58292098792.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/namen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=we+accept+your+offerPDF 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_off0000d0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 17668 bytes
SHA-256: 800f41305c2efcde29059d107bf454ca0ea0820608f9724664d54a8d7bf68c33
font_02_sfnt_off0001168d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168D 10268 bytes
SHA-256: 3672c2bc3810f7342fb7c89745fb1f80fe02798c542a07fb3b76a16b80bc8adf