Malicious PDF — malware analysis report

Static analysis result for SHA-256 6520004054c54cf9…

MALICIOUS

PDF

79.8 KB Created: 2021-02-16 09:37:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c02b3e14b75aa015e20de4c16f67979e SHA-1: b89a6ff43f226c4444dbe47966dc29ca7c4d9076 SHA-256: 6520004054c54cf9bb6c2819e15b2499561e35c0df83f82dc67d9321816b4daf
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. 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
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/wix?keyword=departamento+de+la+familia+tel%25C3%25A9fono In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476756/normal_5fd8b903bc6b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_601ecffa25bf3.pdfIn PDF document text
    • http://rimisirotox.iblogger.org/43937799692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475562/normal_600bf650d50ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476302/normal_5ffb915e3ff1c.pdfIn PDF document text
    • http://123dutch.com/cub_cadet_526_swe_manualbohnr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466664/normal_5fc94f5271979.pdfIn PDF document text
    • http://sfr-espace.best/9051257618fp0o8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470220/normal_5fd68a03bca9f.pdfIn PDF document text
    • http://vasugixoba.22web.org/94275979660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5fea221be86e3.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/sizabo/84104782512.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/neseforolixorupod.pdfIn PDF document text
    • http://fofeparulofiz.rf.gd/anomalous_behaviour_of_lithium.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/google_chrome_web_to_converter.pdfIn PDF document text
    • http://topagujowulefe.epizy.com/zowew.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_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 5152 bytes
SHA-256: c89305296b8b55e13049c411e94a3a497487b695e13ed8221147c30de7719ade
font_01_sfnt_off00010912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 11916 bytes
SHA-256: 14ba7237b1daf4d5c495f6ea574c360f686ba5a40edf31848999b6d7532435b2