Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfa2aa40390799c…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 02:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e27aa2822c6ac9d721fa2fdd96ead901 SHA-1: b26fea24e2b83c9576e220223bd85c436280f70f SHA-256: 6bfa2aa40390799cb56f65609305534be7e39cb9924ad184a980fd733beb0228
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, but the presence of embedded JS and the link farm heuristic suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=best+game+booster+for+android+root PDF link annotation
    • http://shinies.ru/img/lib/file/96347656922.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/vozufobabegivefavujas.pdfIn PDF document text
    • http://corkpotters.com/images/91266553193.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/64304322391.pdfIn PDF document text
    • http://veaodaibrahma.com/uploads/image/files/6826212820.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/23167868688.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/69044860669.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/35622365355.pdfIn PDF document text
    • https://maisonforville.be/documents/file/17036650209.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/rurebesawamugudipewa.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/kuwadekoniruloze.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/mubiwawujatijofar.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/35250473625.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/2216692d2bd858dd9cc5b6ad3be6f3e3/85306775849.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/wejefopofok.pdfIn PDF document text
    • http://kesifveotesi.com/files/53286597554.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/74332779007.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/medojid.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/23384163386.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139f4f712cab---55403171057.pdfIn PDF document text
    • http://fabriziochessa.it/userfiles/file/71619542958.pdfIn PDF document text
    • http://fxmeat.com/upload/file/e7d22a07217ee781d61be5adf039d06a.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/83409606094.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/pukufamaxasej.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/2628928438.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_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 10844 bytes
SHA-256: ce5ed293b6162efadfb93a2eede79d309f3ec9766fdad15977698da84e3f001c
font_01_sfnt_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 17632 bytes
SHA-256: 00a65d5d052afdaf5c48a35d99a2438ff13b1f672de48dec47f615308a231e56