Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cdc7381eac54a71…

MALICIOUS

PDF

67.1 KB Created: 2020-11-18 19:26:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ec286f8d6be2f37b5497530ff260ebd5 SHA-1: 56b3e5af670d452b05dcb5a4a8ba925d7a7448ed SHA-256: 5cdc7381eac54a7108abecfdbd183c155ec74b77fdfcc53469050f96986d7f68
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://traffking.ru/123?utm_term=conceptual+chemistry+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416331/normal_5fb4d4a187d6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411498/normal_5fae1b089e5bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382782/normal_5f956a249b978.pdfIn PDF document text
    • https://nitaluba.weebly.com/uploads/1/3/4/3/134348735/0afdd42.pdfIn PDF document text
    • https://laverikiwife.weebly.com/uploads/1/3/4/5/134502667/4004344.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/54016ee7-bf9b-40ea-8e5a-5fc6d162e3aa/patis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2032b4e9-9330-40dc-a25c-56a8d96abd81/50889741117.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/pairs_of_angles_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09aa5483-9ff7-4317-930a-57c094d5694f/2007_dodge_caliber_repair_manual_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b07932-6bb1-47bd-b17f-85baa72d319e/panico_na_floresta_6_filme_completo_dublado_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8bda850-10ad-458e-9804-b0cd067c96e7/tifene.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_off0000cb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB30 5404 bytes
SHA-256: 489e73318217dfa731276cc1992780b94a512fc3752d779b2edf439dbcc9321d
font_01_sfnt_off0000dd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD65 10104 bytes
SHA-256: 6edfa8fecb5b50a0b96644af8660686e083a50288ea4e83171bb880967da7fb5