Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b402cac3fa3e243…

MALICIOUS

PDF

63.2 KB Created: 2020-12-05 02:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b6cc7e6fa3fdc165dafd05fc9ee10545 SHA-1: d2f00377893205e0ca40cad295a3ab4ccf78a50c SHA-256: 5b402cac3fa3e2439062013e4830b84ed79598edcadcefbb7c8838481288b0e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9998

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 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.
  • 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://trafficel.ru/123?utm_term=judge+jeanine+opening+statement+today PDF link annotation
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/6097122.pdfIn PDF document text
    • https://donurufeto.weebly.com/uploads/1/3/4/8/134898164/kazejijel-tumotoluje-fogixevo.pdfIn PDF document text
    • https://lakafoxure.weebly.com/uploads/1/3/4/2/134266374/1bdbe31a6872c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422914/normal_5fb74a339bbb0.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/6741250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465949/normal_5fb8b9a1d7a53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuxadol/mawilubigevajabapunul.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/angielski_czasy_gramatyczne.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/chunariya_jeeni_re_jeeni_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/lady_bird_lead_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/91201025394.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_off0000ba95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA95 5320 bytes
SHA-256: 96fffe2d8c5a01a058cf173d1cbaf9da0c96819e5ed60855b885a8c032a71381
font_01_sfnt_off0000ccab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAB 9924 bytes
SHA-256: eeacd2e9356fca878b24f43e13b4831a7c04378ccce3684fd83a59bdf83458ab