Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ef66cbed07080e…

MALICIOUS

PDF

70.5 KB Created: 2021-10-10 22:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d9250dc8a30f77a822b951e6a5d34fc3 SHA-1: a96279ec647d11d48bb739c142bcabaf42ef32a9 SHA-256: e7ef66cbed07080e28a2dee6dcb9e5dcbc2c500803ad0c3a4b762e4cf397b66a
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the PDF and its link farm suggest it is intended to redirect users to malicious sites, potentially leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://myarchitect.es/ckfinder/userfiles/files/kofebodenewibu.pdf In PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/jolovibanenifuvonokel.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/bolapumegipuxozolokoxa.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/wefobofedelubof.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/37824642341.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614978c73b119---94118487652.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/jepariki.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/vedesis.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/70651921885.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/jugejopebodanarinuvedud.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/xuridejijew.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210912101757.pdfIn PDF document text
    • http://voijin.com/userfiles/files/muwamegomumutig.pdfIn PDF document text
    • http://clingac.es/d/files/1976381191.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/zurolekasebafanizusifutux.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/pipimarix.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/24954039461.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/fasavuxixafobos.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/99368553915.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/65692799808.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/94436216668.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/kunoguko.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/74685647244.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/90623797247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=zwitterion+form+of+lysinePDF 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_off0000b46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46C 10376 bytes
SHA-256: 027c14b4e450f628759aa6929f5165ee785d4fdd165284b9171fa50da04da812
font_01_sfnt_off0000cbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEF 15824 bytes
SHA-256: 14acb51f11af5f184640ba002616761dcfe824fdb01b94315410795b21e9c251
font_02_sfnt_off0000f482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1