Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a1b08fc5c140fa…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 15:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d636d55ed410c78b3a5bef3f831c7d2d SHA-1: 6b63cc54f3a5cdf38ee014f2cc7c9d49b5cc8a61 SHA-256: 30a1b08fc5c140fa668fa92db108c1d78145ce35e4c64d0e6d7138012a9f4e39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://inwebjor.ru/uplcv?utm_term=nfc+work+in+mobile PDF link annotation
    • http://sushi-belovo.ru/files/nobofilubesuzemodo.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/gazigelorekanekab.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/wesujuloxulufitivi.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7db04b9419ed7e40439460eca29ad1a4/70662869371.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/61347933156.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/povuw.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/53694823195.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/82218588674.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/lexaze.pdfIn PDF document text
    • https://alariel.be/userfiles/file/guxemeluwite.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/82530881358.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/45494137148.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/60333744910.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/reroril.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/89612541027.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/suforozukajokavima.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/xilebevezikogemolebiso.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/4686623865.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/tezutusaboledebab.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/101031074217.pdfIn PDF document text
    • http://mayjack.com/upload/files/10920661979.pdfIn PDF document text
    • http://rjt1.org/upload/files/vamudijinonivesozakimomi.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139a9f5e87f4---82891617989.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/94891016070.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/1930789573.pdfIn PDF document text
    • http://horvathortho.hu/tmp/kabezojafojalix.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/6718081401.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_off0000cc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE447 10364 bytes
SHA-256: 6257255f6885b79602a6c164c2eeb1362b4e30d81147cb00da94363ca7c02e43
font_02_sfnt_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 17332 bytes
SHA-256: 0e9984c28a1fda7bbc8ff2188ac6a032d03f2bc7eab1ca3a34c8b2418606a91b