Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef014f5198dd66f…

MALICIOUS

PDF

72.2 KB Created: 2021-09-12 08:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5204b025d16abcf291b9d7d7a534947 SHA-1: 6ac80d06d09a60e375e3aa8f9b84289a7b8c47df SHA-256: eef014f5198dd66f96de11ecbc36d368bdba9c8733f1c38a8a8f6487cb7c4c05
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and also by an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting and appear to be part of a link farm. The primary function seems to be redirecting users to potentially malicious websites, indicated by the numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=veer+zaara+full+movie+online+play PDF link annotation
    • https://dogathermalhotel.com/resimler/files/3488552079.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/16924235027.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/wasibuzulibezikawanolifek.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/15050809863.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/66526198779.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/toruzasisukavisitovodofum.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/badefesebikodu.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/xudaburi.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/2980046690.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/sajegorufenopejusedumoxid.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/tapikipanu.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/wupazanesi.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/91932056661.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210902070558.pdfIn PDF document text
    • http://iucecb.com/files/file/mujegiketemuvuluxa.pdfIn PDF document text
    • https://artbynela.com/uploads/file/wenezogali.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/kifejolo.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/tunowan.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/23236445191.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161363748d8d28---27092557122.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/wazaja.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/56635160467.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/8947d3.pdfIn PDF document text
    • 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_off0000b4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E8 17300 bytes
SHA-256: bd6e3c905a54dfb2c381ae8a70830000799a8f7c65c2bb80b107b587170ba9e9
font_01_sfnt_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 10560 bytes
SHA-256: d146a60be00ed7401aab802efff47c9b2983efd5bcf00674368600ff2527c6af
font_02_sfnt_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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