Malicious PDF — malware analysis report

Static analysis result for SHA-256 511f5033f7376f99…

MALICIOUS

PDF

74.2 KB Created: 2021-09-22 18:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df5fa851547d9ceab29819c7acf68795 SHA-1: e40a9417f785ee18acf45abb8f9eb6c86833633e SHA-256: 511f5033f7376f997de4939fb8a281e91126525e2fef184adc56367ec680ec35
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the sample, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=v+sat+apk PDF link annotation
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/57391491969.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/luxajid.pdfIn PDF document text
    • http://ridendo.cz/files/file/4192820279.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/16347967898.pdfIn PDF document text
    • https://citytrafik.nu/images/file/79511758686.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/40926512527.pdfIn PDF document text
    • http://www.polni.si/Images/files/77832446915.pdfIn PDF document text
    • http://vecsecity.info/editor_up/77793194479.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/tuzejavubabekedaxutowon.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/40965193335.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c59ccb55bbe388d8e2593faa434c978d/58964354315.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/26922933675.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/20361829461.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/50716737853.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/sikil.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/93224184386.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/26561808725.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/kidamugazonevolibimer.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/95164044750.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/lirur.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/37030437790.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/vegiwatapuwakim.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/benoze.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_off0000b9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A4 9712 bytes
SHA-256: bd132d78da783006a652ff96caf55e7410ab08ef95a4cc73a9c2e4c43cae5e49
font_01_sfnt_off0000cef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF8 21008 bytes
SHA-256: 942d945f533c6c86ad5199b782a337babaac8c86f6b87393e8c1d58d5a8303be
font_02_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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