Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f24a34aafb22fc3…

MALICIOUS

PDF

84.6 KB Created: 2021-09-09 17:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9426ac34d652520ea3894e4d6dca0ab5 SHA-1: 3905880d5256dc496d55d7ecf36b56721772e7e6 SHA-256: 6f24a34aafb22fc3f65c41a34dd782081ec61a95e3778eebeaf1646e049e27e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to host phishing pages or distribute further malware. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=maze+runner+2+newt PDF link annotation
    • http://bilafafafa.com/shopadmin/upload/files/xazenepetojaka.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/volonebuzevesa.pdfIn PDF document text
    • https://cardolf.ro/files/ratebubabal.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/42069806606.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-5/20210905100413519631.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/96635798458.pdfIn PDF document text
    • http://aimic.com/userfiles/file/64937893512.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/43977374669.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/61150359460.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/60281232388.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/39995206625.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb30c091be---26192577291.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/47850647352.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/tesesekuneziwumuravobop.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/xugorokupejexubiveritewiv.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/xosuxokonezatitunometu.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613453b711ac0---reselifa.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/2902789547.pdfIn PDF document text
    • https://kermanrooz.com/img/files/nibuwubobawere.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/42810474940.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/74305299776.pdfIn PDF document text
    • https://toocapen.com/files/wadobukafema.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_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 17312 bytes
SHA-256: 25183b82cceca0cfda25bf7d62fc40f319ca43ca8951a1dd51f5dec229dc029b
font_02_sfnt_off00012e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5D 10036 bytes
SHA-256: 3f60e07fedb4cd096513631fb2cd393bc1acf27495246ca3ee511cc4aeb18ce5

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