Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0b5c4ff43b2738…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 22:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6b4a8fa79387c3906244735d58049c7 SHA-1: 52cae9bd779de1b781183f3cadf010b8d809f6e2 SHA-256: 7a0b5c4ff43b2738fcf4f03af74706d817c4b6c552b6386ff00367a96b45d1ed
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, including one that appears to be a lure for downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=windows+7+apk+download PDF link annotation
    • https://szelvedojavitasmiskolc.hu/files/files/totufuzitizebibi.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/pivaribezegibazoso.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/tifunugubakovanadopozok.pdfIn PDF document text
    • https://tempegaring.com/contents/files/vavupomuvigejafogebumiz.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/fuxiduvijirudimexoxip.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/lezejobapo.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/22301431037.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210909181049.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/94492586515.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/98424950090.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/29924719799.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/sgmb6f6lvehhlruk2r02bl3un7/30927013689.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/63587004130.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/3282132183.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/13149527826.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/jedopeketaro.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109031425208688.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64971354745.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/dasajazuve.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70101733891.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/disukemisenugalelezazozax.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/rupanopumivozizere.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/7454898980.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/fegurujilurirotide.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_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 16084 bytes
SHA-256: a773c16669f680e824bda258ec377be762746f7943e43160a96f58a357c07f38
font_02_sfnt_off00011760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11760 10276 bytes
SHA-256: 93cf5c80c8c9df20c849271320e83d1c9011a036adef3cfa6bd8a7104f81c264

Open this report in the interactive analyzer, or submit your own file for analysis.