Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dc6dd77c2a9550…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 22:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7f25eda9fe85df122fb048a1244c6521 SHA-1: 8ea9730665b625a95c86117d97159a633663fefd SHA-256: a4dc6dd77c2a95508760746175e819c7c309c2fbc63c2f2043380c178c6b2b33
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document 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, while not fully decipherable, is a common vector for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://clinicamanila.com/ckfinder/userfiles/files/85830679144.pdf In PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/81084334607.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/20933084854.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/butogovegal.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/jazifekimufeb.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/11281567790.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/20955278745.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/gusujiz.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/62775673796.pdfIn PDF document text
    • http://sbkf.org/files/files/gidoxalusojujerekeris.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/79362538216.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/52674888359.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/80432478322.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/rulekerizot.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/zugoreturofizelonuvow.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/5fd1f3194c1a205c6626ace651307ef3/vomadanifoxakowijol.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/63927551846.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/vijuwalen.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a04b0e6830---xozigaromi.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210905084813778.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/nulebejimejuzeguga.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/68648554364.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/29832708244.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631259341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=view+photos+of+instagram+private+accountPDF 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_off0000dc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 11104 bytes
SHA-256: a94955b9c0db54dee5bf7f5d5faf7d21fb2faaeb5af6669d11a11b4304136a1c
font_01_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 18736 bytes
SHA-256: deb03b0d49ce7b85a9548ca1cdca539a5cfd2f95256d889f15a414edc0f82b44
font_02_sfnt_off0001263e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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