Malicious PDF — malware analysis report

Static analysis result for SHA-256 31331c6fcebcddde…

MALICIOUS

PDF

80.9 KB Created: 2021-05-20 14:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 6f6945d5d2c0f878e6ccb130eb4d601e SHA-1: 2093d66ab8a270ed1452886bcf0842f59f22aca1 SHA-256: 31331c6fcebcddde04b0f9165514b5489e2755d8895cee159a1ba29ef8da3bf5
214 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded links, many of which point to potentially malicious redirectors or link farms. The heuristic firings indicate that the PDF is designed to redirect users to harmful content, and ClamAV detected it as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'obedient christian wife', likely a lure to entice clicks on the malicious links.

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://crophysi.ru/strik?utm_term=how+to+be+an+obedient+christian+wife In PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/1196451.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471238/normal_5fc8e63bef450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469852/normal_5fea2af737aad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457620/normal_6028a7595f31c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385612/normal_5fc6829feb1b1.pdfIn PDF document text
    • https://seruliwosudaz.weebly.com/uploads/1/3/4/4/134457931/1691899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497109/normal_606c7bc835691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469847/normal_601b1804bbe74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_604a7adb93722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489740/normal_60447344edb14.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/27aa3ab8-4ef4-4b74-96e8-5b0be713621a/what_is_social_tourist_attractions_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e4ba2ad-b83c-40dd-91cd-ef7fc7ae1aee/can_i_listen_to_my_tv_with_wireless_headphones.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/what_is_agile_methodology_process.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cbd9018-630d-4c59-b775-4d0cb0f7e6b0/tukatesobag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd500b2-7aa9-4ec9-8f9a-b61f95176791/krav_maga_manual_espaol_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/aashiqui_2_film_ke_song_video.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_off0000fff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 5268 bytes
SHA-256: ef7d7821cdb8bdcb2924f0757550f56ba96800e321c7cecf44890983557f3909
font_01_sfnt_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 10724 bytes
SHA-256: 9b40ef668bb276245e00182274e907f34185407dd557d8c8d9e23b570d566fca

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