Malicious PDF — malware analysis report

Static analysis result for SHA-256 620022012bd8aa08…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 13:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7df07c38c8f33b0a862ba4aabc1a32c5 SHA-1: 7ae633e0f27c997a2a3b9c987494b2abcea374e5 SHA-256: 620022012bd8aa088c25f512e03652d9d3f94a10eae024d45bce542204d28d08
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or employs social engineering. The presence of numerous embedded URLs, many pointing to disposable domains and forming a link farm, suggests a phishing or redirection attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings point to a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dongtienlamnghiep.com/upload/file/lajurasiwajad.pdf In PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/a2ae5439689888ded0f6b80abb4b0e12/26335004018.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/91428907668.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/wulupedut.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/65256006092.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/29009041077.pdfIn PDF document text
    • https://theurbanthinktank.com/files/72106181945.pdfIn PDF document text
    • https://harmony.im/userfiles/file/22879119427.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/wilurubosujazavebep.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210901140459.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/40411287058.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/galubot.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210907064540.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/23168612953.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/40602594488.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/retimezegizibexosawu.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/rojazebupipilesedat.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/62540262655.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/vowuseditufol.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/3315295413.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/niwizegopevibezisogesar.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133b881ef15f---15483219946.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/38089595235.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/85539206582.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/42041984898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=download+clinical+neuroanatomy+snell+pdfPDF link annotation
    • 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_off0000d018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD018 15928 bytes
SHA-256: 4e566b8faae2e2b7c54771822097b872eeb249f36193c8aaffcc3583bf5db278
font_01_sfnt_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 11084 bytes
SHA-256: 7e188d9751992de62094a40d3cb97424f8acb8f581dc2e45c4d1e218235024b1