Malicious PDF — malware analysis report

Static analysis result for SHA-256 329dbe1c49de0ff5…

MALICIOUS

PDF

76.4 KB Created: 2021-05-15 04:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9622ec2d16f897b19606f003c63d591f SHA-1: 965fea37f192c8dfe264908f1c555b42bd7ce887 SHA-256: 329dbe1c49de0ff5b4688a64c3616b9fa07cdd5be7363b1b6705d48b4b20d699
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/strik?utm_term=saeco+coffee+machine+service+uk PDF link annotation
    • http://tivunuvuzamiguj.22web.org/97433384240.pdfIn PDF document text
    • https://cdn.sqhk.co/jenojigise/V4ggifJ/50_15_in_simplest_form.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/EigqjeN/8895300737.pdfIn PDF document text
    • https://tedarotola.weebly.com/uploads/1/3/1/4/131482933/936ae.pdfIn PDF document text
    • https://cdn.sqhk.co/figesuweno/HhgkygC/jumikadoborokevejake.pdfIn PDF document text
    • http://rapalafipotofuw.iblogger.org/fibrosis_qustica.pdfIn PDF document text
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/kugivok_boboz_puneg_rujojuromikuwug.pdfIn PDF document text
    • http://magewedidi.iblogger.org/67656187932.pdfIn PDF document text
    • https://cdn.sqhk.co/dabekojov/jLghgif/apgli_application_form_andhra_pradesh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7021b5-b6d2-4580-ad8e-f5f46cf7a745/zyxel_pk5001z_modem_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d7215d-c1b5-490a-9ede-301121120620/gumesisirezupovuzuzudil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d309b2c8-b30d-43f4-995c-6de0206993dc/20503723094.pdfIn PDF document text
    • http://pewizofiwerobep.rf.gd/avast_premier_2018_offline.pdfIn PDF document text
    • http://jajunegetilu.rf.gd/bosch_series_4_dishwasher_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6207af89-1069-440a-8c00-ae1776232356/98314091985.pdfIn PDF document text
    • http://denawovusu.rf.gd/sikofugasinisuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64caeb40-7ab1-4205-85a9-da3993fa6aa4/59785486114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e855193-f112-4bad-9611-e94ee01ce01b/bobiguvapanukud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e75397-7123-4b9f-8f23-fcc05e239078/fapepunitusulasof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e798aa7-4b8f-438f-bbfa-17f53520347a/kirin_970_release_date.pdfIn PDF document text
    • http://vedalutepex.rf.gd/ruzutokifuzetij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2003b8a2-f3d1-4974-ac1d-dd252f3473ee/special_education_assistant_job_description_resume.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 5316 bytes
SHA-256: 1a1dd44d249bf7f25701273ff6a7edb5d63bf7318c1ce3ac0a224ab5678e6b9d
font_01_sfnt_off00010017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 10600 bytes
SHA-256: 59390afafa21554278ca5da3de4dab3f23300b2e5b900de4ab58b99d77570254