Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4c948b0b80cafa…

MALICIOUS

PDF

77.9 KB Created: 2020-11-28 04:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6123b02defe20ae5bff64a9acc9951bc SHA-1: 2033850edf683c6ea423a5b2c58af3c990c1883a SHA-256: cd4c948b0b80cafa142eee56bd0784ae391ef179e575275d2168d16351e47669
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=the+life+of+milarepa+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407086/normal_5faf4d05c8bc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_5f92b444b3072.pdfIn PDF document text
    • https://bobilomagavakux.weebly.com/uploads/1/3/4/8/134868487/vexab.pdfIn PDF document text
    • https://lonitavow.weebly.com/uploads/1/3/4/3/134355974/16914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453754/normal_5fa799faeb07e.pdfIn PDF document text
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/muzuwaperixunadawimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414677/normal_5fab5de151697.pdfIn PDF document text
    • https://vilujelirajoki.weebly.com/uploads/1/3/4/3/134378771/3371986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_5f997085b9099.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/e5199fbe-4d88-4d90-b1d9-ea92ec67ad4b/15589484136.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/rijezitenizodegixiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa6d609a-b160-47ed-b79e-0ff6c15f9414/beados_printable_templates.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_off0000f547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 5052 bytes
SHA-256: 01619a13def439d26cccfdfc82b1f3ad007d9996bfd64a316863f6731eac2e7b
font_01_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 11628 bytes
SHA-256: a3ebbdb1f3f86a7cb91744af3a18ec68ce5e6c6ee82ca7e1cce0d0b49157a6e1