Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9495d783b8f8d5…

MALICIOUS

PDF

73.8 KB Created: 2021-09-14 04:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8a170f2ce3467fa2c976cc5825cc6135 SHA-1: 92e0d8ebc02ad9e3f6c8bc38a3beab27cfae1b4c SHA-256: dc9495d783b8f8d54131df9b88d2746bacb5fabbaf9fb5caab8d1fa164c0f69b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. Heuristics indicate this PDF is likely a phishing or malware distribution lure, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The presence of external URIs and the link farm structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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=temple+runner+3 PDF link annotation
    • http://splogservice.ru/content/files/78096551072.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130703621ca8---bimevedekugiz.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/50165664068.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/mutexebuk.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/53384241729.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/rusija.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/32562881266.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/45030909057.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b9e0f4a84d1e3c3e5747e660d3ef5be5/mivenelumunifukedodabukuw.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/83065030987.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/56824709649.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/duganisijejajedamodexiw.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/mamanufimedopazifajesif.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/xofufefofumabokewemitew.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/35863998199.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/dusafevidipazelu.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/51832258481.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/35860790919.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/3894848894.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/59180250845.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210911080121_l4i6va.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/nemazakubosu.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/kovadafuwozuxajidebigojul.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_off0000beae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAE 10008 bytes
SHA-256: ad2d2a7bba7d5a82883940b04e5844b704721472226a9df2e7482c4acdc12b9d
font_01_sfnt_off0000d4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 17356 bytes
SHA-256: d1faf4e22534c1648dc4f8c22bc77c338ae10bf37a90547811f555b741df9849

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