Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c3b0e0f9d605dc…

MALICIOUS

PDF

66.9 KB Created: 2020-11-17 01:00:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e37eb337142bb06257bcf0ee842cabb2 SHA-1: 02801cc0fa5584ee1d069f9db1816c2c0659ad2e SHA-256: 24c3b0e0f9d605dc34dbbc2e79b9382c56c1b5c937912d12a9b81bc0dcb474fb
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm suggests an attempt to distribute further malicious content or conduct phishing operations.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=maria+woodworth+etter+100+year+prophecy In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407084/normal_5f97f0435b8f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_5faaf3c28b46f.pdfIn PDF document text
    • https://didavetamij.weebly.com/uploads/1/3/4/3/134320859/4948834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f88de0f12c1d.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/henghuili-files/94088459266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55bec49a-ae26-4e2d-a885-8fb172773a46/native_american_beads_for_hair.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/8736393110.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/make_size_smaller_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/belajar_gitar_blues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1703598-e8db-46a4-ae7b-b23f855f4e9a/77699574527.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunoje/93513131226.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/logic_games_bible_free.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_off0000c573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC573 5344 bytes
SHA-256: d7f7479282c61aaf487917dcce17227a77e462befd6f9c8930fedf5f76e89840
font_01_sfnt_off0000d7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C1 12256 bytes
SHA-256: 6c57d1d0409d75edd2e3c7c0c5b32eafee1bb675ac46d8bdcb40e91a68dac6de

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