Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c76b87386557c75…

MALICIOUS

PDF

99.7 KB Created: 2021-09-18 04:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe758692dd4eb6c39bf4ed5ba66e2603 SHA-1: db364b8f1aa263316097be8306fa70a518312360 SHA-256: 3c76b87386557c75ad003815c1a9d383b2ab75c99c7f2d4a5b8bf44b56f23f62
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files, indicating a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a malicious intent to distribute content or redirect users through a network of disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rogersdesignhouse.com/uploads/files/60687842317.pdf In PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/69181204261.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109170416168762.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/4333865655.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/bogewex.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/9803633607.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1quk8qit6p6o3f5epms5m9fues/93270671173.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/padosovoxalapidokutifame.pdfIn PDF document text
    • https://wecareprogram.org/images/file/20093571874.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/masemimupereg.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/gekisubefut.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/lojav.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/76717286776.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/51762998584.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/buvobujesumoxegunot.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/mifogefatisejex.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/32765393632.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/jitonizukotutukojaxe.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/solidajozome.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/72136228157.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/12317942793.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/8715467627.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c302ec768c---9755780468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=rab+ne+bana+di+jodi+full+movie+blurayPDF 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_off00011ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FD 10844 bytes
SHA-256: 92ea84bc9cbde5ed8d824e81f9f2373f1e268b3842dac5c7da23f9a334a3c189
font_02_sfnt_off00014fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEF 19012 bytes
SHA-256: 423886d66abadf5a9523a09671c78156d563f6b3d0a83c7098d8aca288587b3b