Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45d1093b3acbe4c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 06:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af692ad3d7a95df4b553bb785efc0695 SHA-1: 5f37b40fa21f8cf2ebba3704fade627320db9323 SHA-256: c45d1093b3acbe4c9febed031f517eee5ecc1f8c7bc0f73c8bafe2198f2aee21
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to PDF files, suggesting an attempt to distribute further malicious content or phish users. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jysfh.com/upload_fck/file/2021-9-14/20210914094440761164.pdf In PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/zonejugulelajefewikum.pdfIn PDF document text
    • https://vgcanada.com/userfiles/file/30490822329.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/4211182332.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/29449050610.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210913153632_ik69io.pdfIn PDF document text
    • http://svx.su/ffile/file/jijamijewotusu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613d653fe789c---fejixurekajawufatoxurise.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/fulepenabit.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/wixujagebagegubekad.pdfIn PDF document text
    • http://moristas.com/userfiles/files/majuninujaluvoxuzuken.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/64679251690.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/1470914407.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/kns32us1n5njm30epksje1cm5s/88229290666.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/xajuziregapi.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109091010095256.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091104415355.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/91311319454.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/50338652291.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/93810388941.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/vuvenefugegobiwana.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/88057150296.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/5294123697.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/2109141151418645578oysn.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/jugusupeliputokaluzuvos.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/nizidoxakajoziwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+automatic+call+recorder+appPDF 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_off0000e0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 10724 bytes
SHA-256: acd0aefc41e90df449ef9e38ca8e355e64e15e2a1fd68cca32fd3346afdd93ec
font_01_sfnt_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 18188 bytes
SHA-256: c09fb4309d97c6d95feab48e55e84c743e4a38dbfeda89ce10559f406c5a281e
font_02_sfnt_off000128e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1