Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8d6a1d0438713a…

MALICIOUS

PDF

73.0 KB Created: 2021-09-09 16:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5df6405b859963f9ca17476096bf92be SHA-1: 175fd359ab8bd5ec8176c5c5035f7a66dd7818aa SHA-256: 6d8d6a1d0438713a0fbd6d5fac000b2ef52d7a538a958b6d9c1903f441fa9113
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The `utm_term` parameter in one URL indicates a potential lure related to managing a child's iPhone from Android.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=manage+child%27s+iphone+from+android PDF link annotation
    • https://sieuthimaycafe.vn/uploads/file/rorajegajapanezonodot.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/8714657030.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/tibofizizavuda.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/6768f4186a993f73ad362ed5bc95651d/98679694775.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/miguzakudolabavi.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/75013576160.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/99034692846.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/45022583121.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/6692297982.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/32970652688.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/22391792656.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/19148784799.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/85310124074.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/lexututixirow.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/modatafevuravalolivepo.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/94209208553.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/guxivuzefuserinaw.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109081405265488.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/balafuz.pdfIn PDF document text
    • https://eguiders.com/uploads/22725759111.pdfIn PDF document text
    • http://unseretochter.ch/images/file/kikuputedimaxev.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m2lk59pgtr8a8bn9d9aa1958ij/35246842055.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/vinevezaxewosakakoxuk.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/geles.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_off0000bb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB07 10996 bytes
SHA-256: 15b3acd548a1dc6350f825577ec12708bbd8570318314af0c29d72e66277fa8a
font_01_sfnt_off0000d421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 16424 bytes
SHA-256: dfda4405284d4d523543abe3508bfa7636dbe1389feceddf56a90c477b337211