Malicious PDF — malware analysis report

Static analysis result for SHA-256 04707c623d8aa58e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 19:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f0f8afb050a1f9f875c291807812727 SHA-1: 8f2809648d8723d4c8697cc5bde1da1c87dad97c SHA-256: 04707c623d8aa58e3a96a31891eadc600aac950950f3f6cfb458b34ef54eea0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. One prominent URL, 'https://smidgel.ru/uplcv?utm_term=download+gangstar+vegas+mafia+game', suggests a lure for downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=download+gangstar+vegas+mafia+game PDF link annotation
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/28189951961.pdfIn PDF document text
    • https://people11people.com/uploads/File/23084967743.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/44803019926.pdfIn PDF document text
    • http://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/resomebukawepexe.pdfIn PDF document text
    • https://dalba.net/other_files/File/jamijo.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/vaxuwidaxet.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/96549112711.pdfIn PDF document text
    • http://bronia.org/userfiles/file/36419525262.pdfIn PDF document text
    • http://hkacca.com/userfiles/69035047685.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/xelokikunukimajubujexop.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/dovafeselatopogifokiwisiz.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/famiwatilakagonumonixak.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/fopemiwe.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/sufej.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/91965780733.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a3761c15e---volomidibediduruzagosoxow.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/163064914195813279.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/22400603315.pdfIn PDF document text
    • https://matratva.in/userfiles/file/39480105077.pdfIn PDF document text
    • http://indexone.ru/upload/file/xexanovejujamajonewajob.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/84bbac3f885d074fe09e02e713f0b5a5/74937169388.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/pojaj.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210919191041.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/23180439973.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_off0000af1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC731 15360 bytes
SHA-256: 19c3b67f3eb0d3f40c8e9dba8b114ba0858bb95a7dcfedea72f3f9f42fef3f30
font_02_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 10852 bytes
SHA-256: c05a65406f3ea8dc01249373067a40b05415eb6e748506eb1d49e4ba9fb6b210