Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca8418dcfbbe506…

MALICIOUS

PDF

72.5 KB Created: 2021-09-23 13:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 950b7face8306bf4034d16c145ef7472 SHA-1: 2cb650e7b8409301a4d075794386c8e4bf017a60 SHA-256: eca8418dcfbbe506cbcff91787ac4b64bfa27dd67861c5c43bd0f26e6d811b4b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://queure.ru/uplcv?utm_term=the+love+affair+full+movie+online PDF link annotation
    • http://faithleader.org/js/ckfinder/userfiles/files/zewedinojanuvu.pdfIn PDF document text
    • http://ashioke.com/images/library/File/87143393466.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/30725894303.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/80562359836.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/wokojinula.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/zivelidu.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/85371344934.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/zizadoxem.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/bamalip.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/98721447091.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/26810409685.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/dofitulidiwolulini.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/57790897904.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/bivabavamawasef.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/9fcceb7dac620fd4e2686da97c9035eb.pdfIn PDF document text
    • https://forumsevens.com/images/file/79816800712.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dadc0beb8---lisurakanu.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/xodirobutegesuzigup.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/gebiguzuwegi.pdfIn PDF document text
    • https://glozor.com/userfiles/file/92677990197.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/23657243221.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/purunoban.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/xutojaxavogegisapuxaze.pdfIn PDF document text
    • http://soc-in.com/data/media/files/86884089891.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/wojusidaribazo.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/keniganulugutiw.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_off0000bb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6B 16012 bytes
SHA-256: 027693ff46232ad7f0c7af9b8f974ebdea8bbec0ddc6e6d676d2c82626f4bb36
font_01_sfnt_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 10340 bytes
SHA-256: 882bbaa4952861e055144589107a27377bef214ee577c5c3d509a0e5517b459e
font_02_sfnt_off0000fbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1