Malicious PDF — malware analysis report

Static analysis result for SHA-256 1539e66a698fc989…

MALICIOUS

PDF

61.0 KB Created: 2020-11-23 13:35:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bf4eda5d117afff5af4c583490d50d20 SHA-1: b309a83a1478c2a78a8ca81955cafbcaa093a4ce SHA-256: 1539e66a698fc9895511c527de835a6df8a3a3dd3641690164aa1f459c9aaffd
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 0.9996

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/strik?utm_term=gabarito+curso+online+fgv+como+fazer+investimentos+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377388/normal_5f8a98f80fee1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490125/normal_5fae79388cb73.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/wimubikor-jijiloj-jemabo-jibeperukidu.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/dutimajizowa/balletomane_performing_arts.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/kikoxonunosevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce5f41a-dff9-4243-b49a-41e8cf83b252/62221975224.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/taxulol.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/ziwotokefo.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/change_management_steps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f4c175-18b9-40af-be07-dcd519c5566e/kinepifaretowofepumik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aec7b4d-dcb7-44a9-aceb-5f7dd65cd0a3/vabetage.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/xadumuzoziwusemeragotu.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_off0000b03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03C 5616 bytes
SHA-256: 1f8f4ec9c45a7a16673a4398e66a5d6b6431c194cd7e2343e468e1597ec6c9bb
font_01_sfnt_off0000c35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35B 11220 bytes
SHA-256: 7eb5b6fe74076ec0eff8201d4ba56b37ce7467c56a0a91f3cc0fa5c634e17555