Malicious PDF — malware analysis report

Static analysis result for SHA-256 683a82669d802c25…

MALICIOUS

PDF

79.6 KB Created: 2021-10-08 13:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6f2a3405f95dab6cc31c423bbcbdd028 SHA-1: 2bde31a4ee210ad37a1a31d7c1563e390ff0ec9b SHA-256: 683a82669d802c25c3a8d13aa62f9e59888dc70a27557b6a75326c38984f9b94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=delete+all+chats+on+instagram PDF link annotation
    • http://keyday.ru/files/files/87604383793.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/26255050031.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/2329788572.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/65378154316.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/gedasibitemitukutelom.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/jasowezadovabofafafa.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/gigexekuzaminaxebuboz.pdfIn PDF document text
    • https://flomogroup.com/upload/files/bukazazeboporurobik.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/xameleparojenixijezog.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a2a0b9fba3---33656239163.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210910190856.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c6344441a3caa0b9e7c6513af64014ad/niwodixut.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/11853304071.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/senagowulirirubu.pdfIn PDF document text
    • http://temple.mo/userfiles/file/9411192325.pdfIn PDF document text
    • https://ms02bet.net/contents/files/gugerulejuzepe.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/fimapodipopunagujideja.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/84679407517.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/35791632944.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/lasegiridiziboxuxuwuvu.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/nojinelukuwanozez.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/8837834988.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_off0000d206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 17812 bytes
SHA-256: a18ce3de4d05943a68318b15010246030b059168e77422cfd0670429ea31a4ea
font_02_sfnt_off00011851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11851 10680 bytes
SHA-256: b3e299132e400d8d1b9c6cc4245e2f63abf0d84fdf19657bfd8d28174d947be6